I was at WDW for the 4th of July 2009. We stayed at CSR and the resort itself wasn't crowded (big resort though) but the parks were. They were manageable for us because we used hoppers, arrived at park opening, and used fast passes... and didn't have children with us slowing us down, ha! We did the MK fireworks on the 3rd as some other posters mentioned. It is the same fireworks show and it is exceptional. I will always remember it! I think we did epcot or DHS on the 4th and thank goodness because that was the night of the monorail crash at MK which really backed things up that evening. Have a great trip!