I've been during that week and US was a virtual ghost town. IOA was marginally busier. WWOHP was busy but not insanely so. We stayed offsite and saw every show and went on all the rides at least once and most rides multiple times. I've been to WDW and US multiple times during both tour group and cheerleader season and have never understood what all the fuss is about. They haven't spoiled or lessened my enjoyment in any way. I wouldn't worry about them at all. You'll have a great time!