I was there last December during Pop Warner week. We stayed at Pop Century. No problem at all. In fact, we have been to Disney in January before and the lines during Pop Warner week were less than in January. We are planning on going in Sept 2012. Whats the weather this time of the year? We froze both times we went in Dec and Jan.
September is still very hot. And usually you get lots of rain.
One warning so maybe add a couple days to your trip (just in case) is Hurricanes! We had to re-book our honeymoon because of one hitting and then the few weeks later when we finally arrived, another one hit dead on in Orlando.
Took 2 days away from our already short trip.
However. I loved the hot weather and when it rained, it was so warm it felt like a shower.

So lots of fun to play in.

But I swore I wouldn't risk that again so I will always avoid Hurricane season.
We're going for our first family trip and first time staying on-site this December. Of course during Pop Warner week AND being booked at POFQ.
But figure it's going to be magical no matter what and I won't let the stress of Pop warner get to me. I know I'm taking a chance but have heard so many different reviews, some being absolutely horrible (mainly at the All Stars resorts and DTD) and some of people saying it didn't bother them at all. So we're just dealing with it. Nothing else is really offered for us to change, unless we go Deluxe and I can't justify that price right now.
I have heard that the families to observe stay at Pop and sometimes CBS & CSR will have a few of the teams. Although the "main" hotels in the past have been All Stars and POR.
Maybe it could change this year on where they're staying?
But here's a little magic to help everyone cope.
And a little rah rah rah to get us in the mood.
But