If you dont mind stirring shit up and sucking it in your impeller, go right ahead;)
But as for the ramp, well have you ever backed your trailer down and had the wheels drop off the edge? Drive ons will blow all the sand away from the ramp. Maybe not ones that are set up nice and the drive on needs nothin much more than a little momentum, with a bit of power at the end, probably exactly how yours is. The thing that shits me, and the reason why some ramps will ban it, is the trailers that may not be set up right or not in the drink far enough or even worse, dont even have an auto latch on the winch post, and the owner is powering on a mass current and causing other boats to start banging into the jetty and stirs all the shit up so other outboards that may be running can draw it in.

 tim-o is exactly right

 Which ramp?

 Which ramp?

 if you know what your doing powering on or off your trailer saves you and others heaps of time at the ramp  i never go through the drama of pulling alongside. Drop deckie of on jetty push back away from jetty wait for trailer drive on hook up and gonski can do the whole process in less than ten minutes 

This ones being flogged on here before , theres always two camps.

Im 100% with willo , if your trailer is set up correctly, and if you have a half a brain , and if the ramp

is done properly, not on the cheap , and the concrete extends far enough out , its a quick effient way to launch and retrieve , done it for years with mates boats,

but not if its not right for that particular ramp.

There alot of IFs in there,  so thats why its not standard practice, and I leave the , winch on every time boys,  too there own beliefs.

 Bloody great holes off the end, ramp on east side is worst. So bad that trailers can bottom as you try to retrieve at low tide.It also means that unless your trailer is lined up with the hole, it sits on a big lean. PITA. As others said, if the ramp is poured concrete and extends way beyond the low tide mark, and it is not sand off the end, fine, no problems.  So you really need a ramp which is poured concrete, sitting on bedrock. The Kalbarri rivermouth ramps are on that block matting stuff, certainly a lot cheaper to lay, but unstable at the end.

 especially being a 1 man band most of the time. I havent taught the kids yet so it leaves it up to me. I sometimes walk the boat (while running the motor) onto the trailer, then as it gets in position i kick it into gear, jump down the trailer and hook it up. If the kids are on board they know to kill the motor and trim it the rest of the way up. When I do this the motor is never running over 1200 rpm. I dont see that much getting stirred as oppposed to driving around the ramp in general. Or if I have a capable deckie I drive on and kill it as soon as "ol mate" hooks it up. 

Quick and easy.

 Ill go an take a pic of tantabiddi tomorrow on low tide and show you how not to build a boat ramp for a place with lots of big boats driving on and off.  A bloody disrace for what it cost to build.  But when some of the charters sit there with twins gion at 2000-3000rpm for way to long and dig massive holes for no reason you have to scratch your head.

+1 for drive on - if your set up and technique is right, can be achieved with minimal fuss and disturbance to others.

A correctly placed trailer in the water will allow the momentum of your boat to do most of the work with a little help from the motor.

I do it all the time. It's quicker, easier and you don't have to wade out and get wet.

The ramps I normally go off Hillaries, Ocean Reef and Mindarie the concrete extends back pretty far so there doesn't seem to be any problem with digging holes.

Yes banned because people drive on and stir it up too much which can cause the sand to be washed away from the end of the ramp or even underneath causing major problems.

I have started to drive mine on, it drives on beautifully but it does stir it up a bit. I can drive it on from a beach launch and its set up well.

Will be getting a auto catch soon!

Otherwise it takes about 8 minutes to winch on haha

 Auto latch is the go. I just put in a bit deeper now an use momentum doesn't stir up all the shit and takes less than a minute 

is a reason, so don't do it. But if not, each to their own.
For example, Hampton Harbour at high tide, drive on piss easy. But low tide no way as it digs out the end of the concrete. But you have a approx. 4m tide range!!

Edit: and on a very low tide - wait for the water to return!

My current boat and my last boat are and were drive ons. If you got the right crew it should take less than a minute or even less than 30 seconds IMO. As soon as the d shackle is on I cut the motor. My current trailer is a skid trailer so the boat doesn't want to slide back which may be different to drive on roller trailers. 

I would also also have the same problem as vinnie if I was to try and winch up my boat. It would take about ten minutes for me to hand winch it up. The auto latch would be a good investment if the deckies aren't up to speed and for beach retrieval. 

I have always driven on and 2 years ago bought a boat latch, works very well you can hear it click on then kill the motor and lift it up. By the time I can get out onto the walkway my wife has it winched up and the safety chain on. Never use it for unloading as I find it just as easy to let it slide off.