There’s really no way predict how “crowded” it’s going to be, and each individual’s perception of “crowded” will be different anyway.
I went on President’s Day 2015 and 2017. Both trips were great! I would describe it as average crowds. I went Veterans Day 2017 and thought it was more crowded than President’s Day, but still had an awesome trip.
But I don’t see how anyone could have a bad time at WDW, soooo...