For me it’s MK, AK, then Epcot (in that order). We tend to backtrack a lot at MK so i easily logged 30,000 steps that day (I like to wear a pedometer to see how far we walk). AK feels huge and there’s a lot of walking without backtracking.
I’d say MK and AK are our hardest days with walking. We don’t ride as much at Epcot. Just the biggies. Then we just casually stroll through the world showcase eating and drinking away the pain from our sore tootsies.