We went last year the last week of June. We took full advantage of fast passes so our longest line was about 25 minutes (BTMRR). If you want to do some of the 'bigger rides' (ie.Soarin', Space Mountain) get your fastpasses early in the day as they will run out. Avoid Tom Sawyers Island unless you love being SMUSHED onto a raft with a lot of sweaty, tired strangers yelling at their kids. Every single day it rained (ok, one day was torrential downpour and wind and NO ONE was doing anything except seeking shelter) for a few hours in the afternoon. Basically, DH hates crowds and he is agreeing to go back next year at the same time so it couldn't have been too bad. I would get there as early as you can (a.m. EMH if you are staying on property) and then by the time it starts to rain or you start to roast, you will be ready for a break of some kind. We got there right after park opening everyday last year and were amazed at how empty the parks were.