Yep. We have everything in the boat so I back it up, get out , climb in the boat, start it up, unhook it from the trailer(roller trailer so I can't do this earlier) and my wife pulls the trailer out and parks.
When we get out of the water, I dock the boat (usually where it won't affect others and go get the trailer then jump in and trailer it. If it is a busy ramp/dock and there is no room to dock, I get dropped off at the dock and get the trailer. Then climb back once the trailer is in the water and the boat is close. My wife gets in the car while I am trailering the boat.
But again, where we boat, I rarely have to wait at a ramp. Even in Okoboji, I know 2-3 ramps that I have never had to wait at and the worst wait was 5 minutes at Emerson Bay on a Sunday afternoon.
If I let my wife back it up, I would still be waiting from the first time we went boating(two years).