Being a leftcoaster who enjoys Disneyland much more than MK, I spend the most time in Epcot.
Plus Epcot is great for people watching. I'm past the point of running to rides, still ride but not a big deal if I don't. Epcot and AK are the most relaxing to me so that is where I like to be.I just love strolling around WS at Epcot, so I probably spend the most time there. But very close second is MK.
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