Expect hot and humid... very humid and, well, pretty hot. I just came back from a quick 5 day trip and had forgotten just how humid it could get.
But, the parks are all open very late, so it's no big deal to hang at the pool during the afternoon and then go out for the evening/night. I saw plenty of people with young children going out to a parka at 9pm (when it closed at 2 or 3 am). I would bet they all slept away the afternoon
I know that we were able to get on every single ride we wanted in a matter of 2-3 hours at night.
Take those fingers out of your ears and start calling for reservatons
OH, the MSEP ends its run on 8/14, if it matters to you. I may fly down for 1 night just to see it again.