With kids in school and a DW that teaches, we pretty much always have to go in the summer months. Crowded?

Hot? Yes Unbearable? No, not if you have some patience.
Make sure you don't try to assault the parks and get everything done thinking you failed if you don't. If you can, go in the parks early, leave to the pools or a nap to refresh, then go back in when it is a little cooler and the crowds start to drop off. Of course, as someone mentioned above, that may cause a problem somewhere like MK on July 4th with the crowds for the special fireworks show. If you can, catch the preliminary showing on July 3rd and choose a less crowded park on the 4th.
Take your time and take in everything you can, and those you can't just plan to do the next time you get to go.

Part of Disney is to just enjoy the sights and sounds and magic, even of the "lesser" attractions. If there are certain rides and shows that you just have to experience on this trip, learn about fast passes and what things you need to try and do first thing so you don't miss them. Then just enjoy all the other things you can experience, especially just being together

in the most magical place on earth.
A lot of people will tell you to skip certain things as a waste of time, but I tell my kids that everything there is a part of the Walt Disney magic, and some of the older attractions were near and dear to him. You always want to be able to say you at least did them all once.
Hope you have a magical time

.....and thanks

for your service!
