BUT ... that link does not restrict DVC members to
only DVC resorts as you said. I just checked on the DVC Website and got this:
So, the OP can pool hop to non-DVC resorts as long as she is not traveling during a black-out time (Thanksgiving).
I really liked pool hopping to the Poly when my DD was younger since it was zero-depth and the view of the castle can't be beat! Sadly, there is no hot tub

. I also really liked the pool at CSR. The slide was fun and we liked sitting in the "ruins" waterfall. The pool at WL is nice and older kids will like the fast "current" in the deep end. The hot tub is located so you can keep an eye on the kids while relaxing

. Honestly, if your boys are "slide kids" then any other pool that you can go to will pale in comparison to the Scary Clown Slide. It's the second best slide at a Disney resort, IMO (SAB being the best). I think CSR's slide is probably 3rd.