I would argue this is not specific to Walt Disney World. It seems everywhere is busier than a few years in the past. I was at Niagara Falls on a Wednesday, mid week, and it was the busiest I have ever seen it. Boat tours, and tunnel tours were scheduled for the evening by mid morning bookings. A few weeks ago in DC, metro trains were full, crowds at the museums seemed much larger, and look longer to visit. NYC times square recently was a zoo too. I think the amount of foreign travelers is significant.