I was at Hollywood Studios and Magic Kingdom on Satruday. Hollywood Stuidos was nice. It wasn't very packed. About an hour wait on RnR and walkon ToT.
MK was another story. When we got there, we decided to hit up pirates and head that way around the park. The line was outside at pirates. In the 5 years I've lived here, I can't recall ever having the line outside, with both sides open. There were long lines everywhere. And people were everywhere. None of us locals could figure out what event we werer missing as to why it was so darned crowded.
Eventually we caved and headed to Poly to watch fireworks. As we were exiting, our friend (who is also a seasonal employee) noticed that the tape on the ground meant they were planning on using the overflow exits through the parking lots behind the Mainstreet giftshops...she said that meant there were more than 75,000 in the park! It was nuts. There was even a line for People mover!
I'm thinking it was just the way we timed it. Based on park closing times, that was the only day that week that MK was open til 9pm. There were no PM extra magic moments. So everyone was either there or at epcot. Either way, it was crowded to the point that none of us were enjoying ourselves.