I was at MK on Thursday and it was very crowded. The waits for the biggies were at least 90 minutes and it was wall to wall people. We had a very nice day despite the crowds though by avoiding them best we could (we followed TGM's advice). We took advantage of EMH and arrived at 7AM. Must have been too early for most, because the morning was very nice. By 10AM it was getting crowded, we left and took a break at 12PM. The buses were packed all day with many standing and many had to wait for a second bus at the stops. The dining spots were a zoo, even at 11 for lunch and 5 for dinner. Definitely don't eat at 12 and 6! Again it was crowded when we returned at 5PM, but really thinned out after 8/9PM. Just go early and stay late. I think we were the only people in the park at midnight. Just walked onto anything we wanted to do.
The weather was beautiful. I'm from SC and wouldn't go into the pool if it was the least bit cool, but I was in every day. It was warm in the parks, but not hot or miserable.
Things should have calmed down a bit by the time you get there. Enjoy! I wish I was still there!
PS- I hope you're not driving! 95 was a nightmare yesterday!!!