I know just how you feel. We’re going 6/29-7/5. I think we can expect packed crowds at all parks for the whole time except maybe AK. The 4th is on a Monday which means a long weekend for most people and conditions will be much like this past President’s Day weekend.
However, you might be in a bit better shape than us. You’re staying longer and crowds may ease up a bit starting 7/5. Good luck to us all !!