Let me give what may be some stronger advice... if you are wanting to go in the summer, make sure you know which dates allow annual passholders, and which do not. IMHO, if you go when most (or all) AP are blocked out, you will probably find the crowds tolerable.
I have gone the last two years, 2011 and 2012, in the first couple of weeks of July, with all AP blacked out, and while it was crowded, it was not insane -- some days were relatively mild, some days were medium, some days were more crowded, seemingly a bit random, probably due to tour groups -- and every day had a full slate of entertainment.
It also wasn't all that terribly hot, obviously that's a roll of the dice, but from what I can tell, it gets a lot hotter there in August...