The Epcot resorts are too close to both Epcot and the Studios for bus service. For Epcot it's just a 5-10 minute walk depending on where you are staying. For the Studios it's about 15-20 minutes. You can also hop on the Friendship boats which travel between Epcot and the Studios all day with stops at the Beach/Yacht clubs, Boardwalk, and Swan/Dolphin. It's a slow but relaxing ride if you prefer not to walk.