I was at Pop for a work conference the first week of this past December.
I didn't notice many teams or kids in the parks when I was there. As others have said they are busy practicing and competing during the day.
As a treat to my kids I decided to visit every resort and take a picture in front of each resorts Christmas tree. On my last day I hit the All Star resorts and I have to say that it was an absolute ZOO at those resorts, especially All Star Sports. There were kids running around and screaming and yelling everywhere! In the lobby, outside by the pool, in the common areas (especially outside of the Touchdown Hotel) etc. What bothered me most was that there were hoards of kids hanging out on the building walkways (outside of the rooms) yelling at the top of their lungs to the kids across the way and below them. Worst of all was that they were throwing things down off to other kids and kids were throwing things up at them. I was so shocked that I called my wife and gave her a blow by blow description of what I was seeing. The absolute topper was one of the coaches or chaperones screaming at someone at the front desk and shaking a pillow from his room in their face. He was upset that the pillow wasn't firm enough. It was like nothing I have ever seen in my life.
I can't imagine ever staying at an All Star Resort during that week and putting up with that behavior. It was appaling to say the least.
J