We were there May 19-24 in 1999 and the weather was sooooo hot everyday, but the crowds weren't bad at all. No rides had really long waits and eating was never a problem for us either and we didn't have any PSs. We'll also be going this May 20-25 and I'm hoping it'll be the same crowd-wise, but better weather, definitely a little less heat and humidity. It didin't rain very often though, but if it had maybe it would have cooled down a bit. I will warn you though that we're going with a large convention that will be staying at the GF for those dates, possibly a few days before and after. It's a pretty flexible convention and the meetings are only held from 9-12 each morning and only for 3-4 mornings during that time (probably 22, 23, 24, 25) so I'm imagining a lot of conventioneers will be in the parks in the afternoons. Additionally, about 99% of the people involved in the convention are bringing kids and grandkids (we're taking my whole bridal party since my wedding is 2 weeks later) so I would expect to see them in the parks all morning too while the convention is going on. Not sure exactly how this will impact overall crowds since we've been there for conventions before (and I'm sure there are conventions there everyday) and never noticed a problem, but they were always in off-season months, like November, so the parks were empty to begin with, but just thought you might like a heads up on any potential crowd influences.