Overall, it was a pleasant experience. Worth it? Probably not. But at the time we made our ressies, we wanted to try the BWI, and that was all that was available. We stayed there last November, for the Food and Wine Festival.
The rooms are comfortable, and we had a HUGE balcony overlooking the Boardwalk and the Flying Fish. But we hardly ever went out there, so it was sort of useless. TIP: Unless you enjoy a lot of noise outside your window until about 10:30 at night...don't stay in a room over the Boardwalk. The place gets busy and raucous. Oompah bands and all that. Sigh.
Anyway ... it was nice having someone to check our PS ressies and make new ones for us. And I suspect having a concierge person call helped snag us seats for Cindy's breakfast without any fuss.
But the food in the lounge is only so-so, and after a couple days, sort of boring. (Though the late night desert snacks were neat -- chocolate covered strawberries!) They also do not keep chilled water or sodas on hand. So taking a small bottle of lukewarm water in the morning, for a day in the parks, was less-than-satisfying.
I'd stay at the hotel again in a heartbeat; the place is colorful and fun and very convenient to everything. Service was excellent, too. (We're new DVC members, and I'm sure we'll visit there someday in the future!)
But I wouldn't spring for concierge again if I didn't have to. Just not worth it, imho.