WE went last year starting on Thursday to monday and the busiset day for us was sunday at MK, we thatougth that so hit that on thursday and friday. There was no real congestion to friday evening. we did short trips to epcot and MGM on Saturday and did not really run into long waits that fast pass couldn't cure. Sunday at AK was more crowded, but not as bad as we have seen during the summer. sunday evening at MK was crowded but not overwhelming.