We walked from MGM to BCV one night and actually BEAT the boat which left MGM at the same time (Alot of boat stops). Nice long evening time walk and away from the beaten path.
Yep, walking from BCV to Epcot is just a hop and skip. No sense waiting for a boat...besides the boat always runs counterclockwise, meaning that it will stop at every other resort first (MGM too I think) before heading to Epcot.