First, let me say that we love Disney, go often, and are one of those families that are questioned why we don't go other places more often.
That being said, BLT is almost a little "too" convenient. When we returned, my wife first commented that she didn't feel like there was any down time. At SSR there are outdoor walking paths, small pools, and you know you are at Disney, but the parks seem a world away.
At BLT you are really in the middle of the action. You can't go to the restaurants at the Contemporary without seeing the monorail bringing people to and from the parks. You can't be out front of BLT without hearing the train whistle from the Magic Kingdom. You always know you are merely steps away from being in a park, or on a monorail.
Even our day hanging out at the BLT pool there was always the thought that everything was so close, shouldn't we be doing something more than just sitting here?
I will definately go back to BLT, we had a great experience. However, we never really felt that relaxed down time like we do at WL or SSR. Maybe if I lived in New York City, or stayed at BLT often, I would get used to it, but it always felt a little hectic to me compared to some of the other resorts.