We were there for this past 4th of July. We are a family of 4 with adult children over 21. On July 3rd we did Animal Kingdom in the morning (only Pandora was swamped ) and enjoyed the pool in the afternoon. We were lucky to have reservations for dinner at the California Grill on the 3rd. We stayed and watched the MK fireworks from the observation deck of the restaurant. The fireworks were amazing!
Only July 4th we went to EPCOT spending the morning doing rides and using our Fast Passes. I made several restaurant reservations throughout the day. We would escape the unbearable heat and enjoy a drink and our favorite appetizer/dessert from that particular restaurant in the wonderful air conditioning. We were luck to have Rose and Crown reservations for the timing of the enhanced Illuminations. I guess we were given a little pixie dust because they seated us outside by the railing providing a perfect view of the show.
We were at EPCOT from opening until closing. Honestly, we were only able to be their for that length of time by escaping into the AC.
The parks were definitely more crowded than what we are use to. For comparison our last few trips were in mid-May, mid-December and late August.