Lets make sure we're on the same page. You're talking World Drive toward MK, through the right lane at the toll booth then Right on Vista Drive to Right on 535 (Winter Garden Vineland). Left on Reedy Creek Drive and the WD is a couple of blocks on the Right. It's almost exactly 10 miles total that direction from BWV, over 10 miles further RT, a little less maybe from BCV. Actually taking Live Oak over to BV is a little further than just going all the way out Vista blvd though last time I went that way it was a little creepy.
Likely a better option to miss some of the lights and traffic and still get to the WD from the Epcot resorts would be to cut over to I-4 either by Osceola or 536 then exit at 535 though you do catch that intersection at the Crossroads that way. From SSR, VWL and OKW though the distances are shifted though I still think that way is reasonable only for VWL (
DVC resorts).
On a related note, I wonder if they will close of Sherberth once AKV is fully open. I'd think they'll eventually either have to improve it or close it down as an in/out for WDW.