Hi there, Kerry!
July, because of the number of children out of school for summer vacation, is considered "high season" at the Walt Disney World Resort. The crowd levels are definitely above the average, but with some strategizing, you should be able to work through all of your must-dos with limited fuss.
I'd advise you to get to the Park of the day for opening ceremonies, and hit your favorites immediately.
Also, I'd recommend staying at a Resort on Disney property for one major benefit that will certainly help you maximize your time:
Extra Magic Hours (EMH).
Every day, one Park will open an hour early or remain open three hours after closing for Guests who are staying at Walt Disney World Resorts. You'll just need to have your Key to the World available to show to any Cast Member who requests ID.
You'll find Disney Resort hotels to offer the most comprehensive theming and Disney touches. That's the fun part. The practical part? Convenience. In addition to EMH, you'll take advantage of constant shuttles and monorails. unlike many other hotels, which offer "scheduled" - as opposed to continuous - transportation.
Whichever you decide, you are sure to have an incredible time!
See you later, celebrator,
-Deborah B.