I run into that same thing here in Indiana almost every time I go fishing. Now, I have two boats. A forty year old fishing boat replete with brand new state of the art equipment such as a new four stroke engine, GPS, and such, and a 23 foot sloop. One thing I always do is pre-start the engine both before I leave home, and again, just before I launch. Just enough to make sure it's starting. Then, like you say, I back down, launch, my wife drives the truck up to the big parking lot, and I go into a holding pattern off the one and only little dock till she walks back down the ramp. I pull in (assuming some jerk has not parked his big fancy ski boat crossways off the end of the dock and has both sides blocked...) and we are gone... It's always the same. The boat is across the end of the dock so no one else can use it, one person is laying on the dock sunning themselves, and someone else is screwing around carrying coolers and stuff back and forth. They look around at all the other boats waiting their turn, and act as if you are not even there. One of these days I am going to completely GO OFF on one of these hotshots...!!! It always amazes me how often guys back their boats down into the water, and discover they will not start, and obviously have not done anything to them all winter, or for a long time... Trip after trip back and forth from the truck with "stuff"... and just like you say, they hold things up something awful... Hey, everyone can run into unexpected problems, but nearly all of it can be avoided by just a few moments of prep before you leave home... then, if there is going to be trouble, at least you can fix it before you have a boat in the water, off the trailer, and are drifting out of control and causing trouble for everyone...
One last thought... people in big, expensive fishing or ski boats that literally cut you off, cut in front of you, and since you are just in a little fishing boat, think they can "pee" on you while they either pull into the dock that you were approaching, or cut you off as you are approaching your trailer... :evil: There, I vented my frustration...