BEFORE launching have your boat ready, cooler, thermos, bait, rods, everything in the boat. Cover off, straps off and ready to get wet. Have your buddy man the lines and slide it into the water and have him walk it down the dock so the next guy can launch. Park your truck walk back get in and go.
Nothing worse than the guy that just launched his boat sitting in it trying to get it started or worse - dealing with dead batteries. Move your boat out of the way!
I watched a couple of guys at the LaSalle launch on Detroit River and there were about 6 guys in the line waiting to launch. They paid the lady and pulled ahead and started to back down the launch and stopped short. Both guys got out and starting peeling the cover off, and taking straps off.....and then taking rods out of the truck and putting them into the boat. Several of the guys in line just lost it on them - never a dull moment.
Last pet peeve are jet Skiers that do not wait in line like the rest of us.