We're doing the YC this time around. Why? SAB. It's a split stay between Disney and the beach. We've got 4 nights and 4 days in the parks. I don't think we can cram in a water park, so a great pool is what we're looking for. The kids loved the volcano pool at the Poly, but it is small. Dh also wants to be near the World Showcase for dining (his Disney priority).
All that being said, any of us would go back to the Poly in a heartbeat. Huge rooms. Monorail is so convenient. We never picked up the resort monorail, always walked to the TTC. Boat ride to MK is nice, too. If the trip were long enough to squeeze in a day at Typhoon Lagoon, we'd be at the Poly, no question.