We went this year during the first week and it was way busier than we expected! Several school districts have that entire first week off, including ours, which is now why Disney (in my opinion) has pushed their Holiday time back. It's not 4th of July busy, but it was busy. We arrived on a Tuesday and the wait for Matterhorn was 45 minutes at around noon. The other issue was you could tell the resort had no idea about the impending crowds and they were grossly understaffed (one cashier working at the Mint Julep bar, 1 track open on BTMR even though the line was 30 minutes long, etc.) Frustrating. The fact that they have officially extended the holidaytime tells me they at least will have a better handle on staffing (hopefully).