I answered "walk," but I think it depends on where you're staying (and when). If Beach/Yacht club, I ferry to DHS and walk to EPCOT. If at Boardwalk, I walk to DHS and ferry to EPCOT. We usually stay in the summer, but when we've been there in non-scorching-hot months, we walk to both DHS and EPCOT.
-Dorothy (LadyZolt)