I concur with supply and demand. It can be very hard to get into BCV, esp. studios, at the 7 month mark. I was able to get a 1 BR recently, and enjoyed my stay there. It was at the slowest time at WDW I have ever seen though.
While the building is separate, the covered walkways between it and the main building are very short. The marketplace is esp. accessible from BCV. Beaches and Cream is a bit of a stroll, and I never went over to the Yacht club, but you are about as far as you can get from it and still be in the resort. Stormalong Bay also has an effect on the resale price here. It is the best pool complex on property. I did not find the walk to it from BCV to be inconvienent, but it isn't outside your door either. But this isn't the pool you just go to for a quick dip anyway. You will stay there a while. The pool for quick dips at BCV is adequate for the crowd it attracts.
Epcot is still very close. You just take the first right after crossing the bridge, and you are a shady walk away from your room. I walked over to Boardwalk twice and enjoyed the ammentites they offer there at night. You can have some of the best of both worlds when you stay at BCV.
The one advantage I had never read about before regarding BCV involves DHS. The first time I commuted there, I was not allowed to board the friendship boat (guy was not to "friendly" about it if you ask me, but I understand why it has to be that way) that I wanted to take that morning. So we waited 10 min. for the next one. The walk from BCV to DHS would be the longest possible walk of any of the Epcot area resorts, so that didn't really interest me. So we catch the boat and make it there after the rope drop, but still early enough to have a great Monday morning. Later that week, I realized you are FAR, FAR better off driving over DHS from BCV than any other mode of transportation. The parking lot that was mentioned earlier has spaces that are just feet from the end of the hallway. It is not much different than being able to park outside your door like at OKW for instance. Exit the resort, take a right, and the next thing you know, you are at the intersection to enter DHS parking lot. I mean like 6 minutes from room door to "Okay, which row are we parked on?"
But back to the point, I think the advantages of BWV are the closer proximity to DHS, that makes walking there a real option. Also, the ability to book standard view rooms for those ridiculously low point values at the 11 month mark. To be able to stay at an Epcot area resort for those kinds of points is a great deal.