Like many, my entire family (which is only 5 people if you include the new brother in-law) spends most of our time at Epcot. The food, rides, culture, International CMs, fireworks, proximity to the DVC Villas, laid-back atmosphere and shops all add to the reasons why.
Here is the breakdown for an average trip (days):
Epcot - 3.0
MK - 2.0
DS - 1.5
AK - 1.0-2.0
Water Park - 1.0
Other - 1.0