Interesting & thanks -- but I'd be curious to know the answer to the main question anyway: what's the best pools for hopping?
What are you looking for.
The Poly is a nice pool for a MK break. Nice slide with a tunnel, attached the the beach, zero entry.
Like Maria, I like the WL pool. Its so wonderfully well themed that the lack of zero entry and tiny slide don't bother me. My kids aren't slide kids, and at my age, I'm just as good with the kiddie slide.
SSR has a fantastic pool area, but it isn't easy to get to.
BWV would be the one to hop to if you wanted a break from Epcot.
The POR pool is very cool. Coronado Springs has a lot of fans.
But frankly, we've found hopping to be far more trouble than its worth. A pool is a pool - even SAB isn't worth walking over from the BW for when we can hop there (staying at BW when the slide is being repaired) for us. Transportation, time to get somewhere else, wet swimsuits, changing if you are taking a park break. It isn't our thing.