Well certainly MK was the most crowded for us. We went to AK today and it wasn't horrible (Everest around 45 min, Safari around 50) but the number of people is just not something we are accustomed to...we usually visit in early Dec or Jan. Epcot and DHS have been fairly crowded but to be honest, we don't really care about rides
when it's just the 2 of us so maybe we aren't good judges.