We were there the 15-20 and it was much more crowded than I expected. It was pretty similar to President's Week (excluding President's Day itself) and waits could be long, but were variable. What I mean is that we walked by Peter Pan's Flight and the wait said 70 minutes and the wait for Small World was 15 minutes. We skipped them and went to Haunted Mansion, which had no wait, then took a bathroom and rest break, went back to Small World which now had no wait, then Peter Pan, which was down to 45 minutes (we had a FP for it anyway). It was really hard to plan out our days though since you never knew which attraction would have a big line at which time. This was pretty much the same in all the parks, especially when ToT reopened and had 90+ minute waits, but RnRC only had a 35 minute wait. The weather was great though and we didn't have rain at all during our trip.