We were there during POP warner week in 2015. Crowds were low for the most part in the parks. The only negative experience we had was on the safari at AK. A pop coach was on his phone with his wife back home nearly the ENTIRE ride. It was so incredibly rude. He said to his wife, "I'd better go, I'm on some animal ride." Some animal ride, really? It was obvious he could care less to be at Disney.
But otherwise we had an amazing trip. Low crowds, great weather. So much so we are planning another trip for 2017 for after Thanksgiving/ early December.