Do you drive one of those boats? We've had over 40 stays at WDW and a part of those stays is usually at either the Polynesian or GF. In the early days, all but two were exclusively at the Polynesian. Of course in the 80s the boat routes were different anyway.
Anyway, we rarely go during the holiday season nor in the summer. Our experiences are not usually at closing either. Most often we ride the boat back to the resort midday.
Anyway, we'll be back very soon and I'll be watching for those three boats.
BTW, is there some reason for what seems to be hostility in your post? And do you by chance pilot the boats on the MGM/Epcot resorts/Epcot most of the time? I can only comment on my experiences and what is usual in those. We're all here to have fun and share what we know of WDW.
I do agree with you though not to count on the boats. Occasionally they don't run at all and they also don't start early in the am like the resort monorail. I also remember a couple years ago when only one was running and we asked the captain why. He replied that someone hadn't shown up for work.