Definitely big crowds. But alot of fun and really hot! On my other July trips I never made many PS'S but this year with the new dining plan I have definitely one PS made already for a sit down restaurant every day we are there.
I am not taking any chances, I read from others posters that they turned people away that didn't have any PS'S. So I can imagine what summer will be like....
If you are flexible and don't really mind eating a little later, you might not have a problem dining. But if you have kids, I'D get on the phone ASAP!