Item #3 on unloading and launching for sure. I've seen an extremely busy boat ramp on a DFW lake get tied up for several minutes because rookie pleasure boaters backed down the ramp and then started loading stuff from their SUV to the boat with a dozen or so people waiting in line to use the ramp. With years of practice under my belt from tournament fishing I've turned unloading and loading into something that can be measured in seconds rather than minutes, even rolling solo.
One other thing I'd like to stress; this probably ties up more time on the ramp more than anything, is to make sure your motor is ready to start. Go to Walmart and purchase a set of water muffs that connect to your garden hose and fit over the water pump inlet. These work with Mercs and all other brands but Yamaha. If I remember right Yamaha's have an attachment built in them to attach a garden hose. NEVER AND I MEAN NEVER run your motor DRY without WATER. You instantly destroy the water pump. Plastic rubbing against stainless steel creates instant impeller melting heat @ hundreds or thousands of rpms. Get the water attached and on, go through your normal starting procedure and run the motor until it warms up all the way and starts peeing water. If it don't start don't take it to the lake. If it didn't start @ the house it won't start @ the lake. You can also do this the afternoon before your trip to the lake. Now when you back the boat down the ramp the motor fires instantly and you are ready to let the trailer clear the ramp in seconds so someone else can get launched. This prerunning procedure is something that can be done every two weeks when you aren't using your rig regularly. It can save you tons of money having ethanol damage repaired from letting it sit, use treatments too.
Live in Texas..... Born a Louisiana boy heart and soul.....
Isaiah 40:31 "but those who hope in the Lord will renew their strength. They will soar on wings like eagles, they will run and not grow weary, they will walk and not be faint."