I hear that, it's for sure a bit longer walk from VGF and I'm probably in the vast minority of those who'd consider walking from Island Tower.
Comparing the walks from BLT to Grand Floridian I timed it out this last trip and it took about 4 minutes longer than the BLT walk. I think we always took the monorail
to MK, but I walked back to Grand Flo from MK nearly every time (I think I took the monorail back once). I guess at the end of the night I have no patience to stand still and wait for anything lol, even for a couple minutes, so I'd rather keep moving and make the walk back instead of wait for a boat or monorail.
One last thing I wanted to mention about walking, I was surprised to find out that the walk from our room at BWV to Hollywood Studios took less time than the walk from Grand Flo to Magic Kingdom.