I don't know any other way to put it other than the weekend crowds are INSANE! Realistically though, crowd-wise things start to get heavy into Friday evening and do lighten up into Sunday later in the afternoon. If you want to check things out on Saturday or Sunday, your best bet is to hit the kiosks right after they open (around 11AM ?) til ~ 1PM. Sunday may be a bit better than Saturday, but I cannot stress how crazy crowds on Saturdays can get in the World Showcase. Unless I have specific F&W event booked, I avoid the weekends.