I was there during Pop Warner this year, and didn't notice anything at all in the parks. I was staying at Pop Century, and I definitely noticed them in the pools. There were two large groups at our pool the day we tried to go - one was very well monitored and well behaved, the other was a disaster, and was warned multiple times by the lifeguards that they were about to be ousted from the pool if they didn't start listening/following the rules. Bottom line - if you like to go to the pool at your resort, I would stay away from the values during PW, but otherwise, they were absolutely fine.
If you are going to stay at a value during PW, book a preferred room. While certainly "noticed" them (read: were annoyed by them) at the pools, we didn't hear a peep at night, and their rooms weren't anywhere near ours. I suspect they do not book blocks of preferred rooms. Crowds at the parks were very low.