Just got back from a trip with mine, aged 3 and 5. We had 4 park days with hoppers, and did 2MK days, AK day, then split one day at HS/Epcot. My kids cared nothing about Epcot and if I had a do-over, we would have skipped Epcot and went back to resort pool.
ETA: we got there about 3pm and were...