Originally MK was supposed to only be open until 10pm yesterday (the 16th) but it changed to midnight a couple weeks ago. They ran two Spectros (9pm & 11pm) and Wishes at 10pm. I hit three parks yesterday and it was busy but nowhere near slammed. (We waited about 40 minutes for Toy Story around noon and 25 minutes for Big Thunder around 11pm for examples. Pirates was walk-on and so was Haunted Mansion.) It was a nice day at the parks yesterday.