Because WDW is a destination resort people tend to travel on the weekends. However, weekends in the off season is when the locals visit. Rule of thumb is Monday is the busiest, then Tuesday, Thusday, Wednesday, Sunday, Saturday & Friday is the slowest. Anytime there is not parade/fireworks every night, expect the days they are offered to be the busiest. This week that makes Wed/Sat busiest and next week Sun/Wed/Sat.