I was just there in Feb.
I walked to MGM once. It's a 10-15 minute walk at least and unless you are extremely slow you will definitely beat the boat
BUT depending on your fitness level you may not want expend that much energy before touring the park (or have that much left when you are done).
The boat from BWV to MGM has this stop itinerary:
BWV -> BC/YC -> Swan/Dolphin -> MGM
From MGM to BWV:
MGM -> Swan/Dolphin -> BC/YC -> BWV
The Swan/Dolphin boat dock is about a 5 min walk from the BWV. I started using their dock to go to and from MGM. It was less tiring than walking all the way to MGM and made the boat ride shorter.
I didn't get a chance to walk to EPCOT. My brothers did and said it was very short compared to MGM.
However the boat trip from BWV to EPCOT goes like this:
Swan/Dolphin -> YC/BC -> BWV -> EPCOT
From EPOCT to BWV:
EPCOT -> BWV -> YC/BC -> Swan/Dophin
With Boardwalk being the first stop, I didn't mind the EPCOT boat trip at all.
Hope this helps!
Have a great trip!
Cindy K
Next Trip: Oct - 4 days of Wonder(
DCL)/ 3 days at VWL