a few comments ... my last visit, staying at GF I never went into a park but explored other hotels that I could get to via the boats. He's where the various resort boats tie up at MK in the area I marked with yellow square which acts as the center of the hub and spoke arrangement that's basically how the boats run. Th GF boat used the pier with the blue roof and as I recall the boat to WL which also headed to campgrounds is the orange circle. Which is which is clearly signed ... WDW NEVER seems to have a shortage of signage!
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the boats ran almost continuously and I don't believe I ever waited more than 10 minutes ....
I also did some bus travels and typically waited longer for a bus BUT the bus DOES hold more people ... the SOME of boats are small in comparison. If there is a LONG queue for a boat you could be waiting a while but I find the boats little used and was never on one that was full. I saw different boats used at different times for each route ... larger ones used near opening times etc ....