Well it's definitely NOT humid and it's pretty amazing weather, sometimes you'll get a hot Easter, sometimes a cold one but it's never extreme. I've been to Disney World in June and I felt like I was suffocating (in AK) with all the people. I can't even (and don't want to) imagine it during Spring break, one of the PEAK times of the year.
Yes, Disneyland is smaller but I feel it's way more manageable to see more in less time. It's SO easy park hopping at DLR compared to WDW, considering DCA is like 200ft away from DL.
This might be a biased opinion (I have a DL ap)