Well one difference is President's DAy weekend has some school breaks (winter break) also happening around then so people can get a longer break by combining Prz Day 3 day weekend with a school break. I do know last November I was pricing out Prez Day weekend, and Memorial weekend and seemed like no discounts available for Prez Day, but there was some for Mem. Day weekend/week. So that tells me Diz expects full hotels for Prez Day but not for Mem Day. One thing about Mem Day...many of the country's very large school districts are not out for the summer yet at that point, but it is in the last month of the school year so they're not apt to pull kids out for a vacation that close to the end of school. That helps keep the crowd levels down. You will see bigger crowds on Sat & Sunday due to Disney being a popular destination for locals (we saw that 2 years ago on Mem Day weekend) but the crowds went down on Mem. Day and stayed pretty manageable during the week following the holiday. We have been there the week before Mem Day several times, too...the crowds levels were low up until Saturday. Thursday & Friday before Mem Day were probably crowd levels no higher than 5. Saturday at the Epcot & Sunday at Magic Kingdom were closer to 8s & 9s at times. Mornings were good, but evenings with EMH at MK was crazy busy (Peter Pan at 120 minutes at 9:00 PM on Saturday of Memorial weekend.) In the AM it was 20 minutes, though, so if you plan to do headliner/super popular kid's rides in the morning you'll be fine. It's nothing like the big holidays, for sure.