Touringplans.com rates the crowds as mostly 7's & 8's during that week:
Date: Crowd Levels: Best Parks: Parks to avoid:
Sat, 30 May '09 8 MK DS AK
Sun, 31 May '09 7 AK MK EP DS
Mon, 01 Jun '09 8 MK EP DS AK
Tue, 02 Jun '09 7 AK MK EP
Wed, 03 Jun '09 7 MK EP AK
Thu, 04 Jun '09 8 AK MK EP
Fri, 05 Jun '09 7 EP DS
Sat, 06 Jun '09 8 EP DS AK
Sun, 07 Jun '09 7 AK MK EP
(EDIT: hmm, for some reason when I post this the site is messing with my formatting but hopefully still makes sense)
7 MK: Peak waits of 65 - 74 minutes EP\DHS: Around 105 minutes AK: Around 65 minutes Around 90 minutes
8 MK: Peak waits of 75 - 84 minutes EP\DHS: Around 120 minutes AK:Around 75 minutes Around 110 minutes
Being a season ticket holder living about an hour away I go pretty frequently and since Good Friday the crowds are definitely lighter, though this weekend (memorial day) will probably be pretty packed. However by next weekend (when you arrive) hopefully the crowds will have thinned some.
I am really hoping so cuz the wife and I are also staying at the campgrounds from 5/30 - 6\4. heh. If you see a couple walking two brindle greyhounds and a white cat thats us!
Have Fun!
Chris, Sonya, Tahoe, Jackpot & Shadoe