It is less than 1/2 mile, but you cannot really walk. There are no sidewalks at WDW except in the resorts. There is nothing but a busy street (6 lanes total, 3 each way) from CBR to BW. You could possibly walk in grass next to street but Disney security personnel very often stop walkers and request that they avoid doing so outside of resorts. Only Disney transport way is by bus; best to bus to MGM and walk or boat over from there. Fastest way is car or cab, which are very easy to get at the resorts.