K.C.
It will be crowded, but not totally packed. Los Angeles and Orange County schools will not have started yet, so there will still be a lot of local kids on vacation. But schools in the other counties of So Cal start in early/mid August, so at least those kids won't be at D-land.
Also, a lot of annual passholders are blacked out all of July and half of August. When our passes start working again on 8/22, a lot of people will try to go before the kids are back in school.