We've stayed at the Epcot area resorts numerous times and we've always commented on the relative quiet of the weeknights v. the bustle of Sat. nite. Again, relative being the operative word as depending on the time of year you go, it could be pretty crowded on any of the nights. We love the Boardwalk and love hanging out at the Bellevue (sp??) Lounge at the BWI and then going over to Jellyrolls. The atmosphere is just great!
Have fun!!