Another data point. We went to the MK today, deciding about 10:00 am. by making lunch reservations at the Wave, and figured we'd look around. We walked over, and saw a medium sized crowd, which was surprising for a Sunday at the end of May. Went standby onto Pirates (10 minute wait), then on Mansion (20 minutes), and then Peter Pan (25 minutes). All reasonable wait times, and we could have done Small World (10 minute standby listed), Splash (45 standby listed), big thunder (30 minutes), and we assumed the rest of the park would be similar.
Why the reasonable wait times? We believe it is because Both Tomorrowland and Fantasyland were closing at 5:00 pm., and the entire MK was closing at 6:00 pm. We're speculating a private party (if anyone knows please inform), but droves were apparently avoiding the MK since the park hours were so limited. We saw numerous people turning around upon seeing the boards advising of the reduced hours (we didn't care since we have APs), so that is first hand knowledge that certain things can adversely effect the crowd levels at the MK and by extension the rest of WDW.