My 14 year old son is now capable of pulling my boat on and off the trailer and picking me up at the dock. i always felt bad when I had to leave my vehicle on the ramp and get the boat to the dock and then run back to park the truck.
I have always noticed though, it is usually helpful to help someone who may have their first boat and not know of all of the unwritten rules of the boat ramp. I once broke up a fight on a ramp in Kentucky because a fellow had wedged his pontoon into the trailer. It took 20 minutes to get them to stop fighting and about 2 to help the guy out.