From BWV it's about 10 minutes at a brisk pace, or 15 at a more leisurely one.
I find I enjoy the walk at the beginning of my trip, but by the end I am so "walked out" I take the boat. Even the less than 5 minute walk to Epcot becomes a drag eventually. I am physically fit and exercise frequently, so it's not that I don't like to walk usually. But after a few days of hiking around the parks I almost always opt for the "lazy" way!