Disney considers the Boardwalk area a destination in and of itself. Guests visiting the Boardwalk are welcome to park there. Recent visitors to the BWV have reported that the guards have been directing those who are not actually staying at the BWV or BWI to the lot across the street. This allows those who are actually staying at the hotels to park in the lot(s) nearest to the hotel. This is especially true in the mornings when there really isn't all that much happening on the boardwalk. Nearly all of the "parkers" at that time are really going to EPCOT.
If you are coming to have dinner in one of the Boardwalk restaurants, to go to one of the clubs or just to enjoy the Boardwalk activities/entertainment, you should feel free to park in the BW lots. Just be prepared to park in the lots that are farther out - i.e., across the street. If the walk is too long for your party, you can valet park for $6 plus tip. As far as I know, they are not giving out 3 hour passes to people trying to park at the Boardwalk.
I am also a DVC member and I totally agree with Anne about those who park there and go to EPCOT or MGM. IMHO, that is rude and inconsiderate. However, as long as Disney continues to reserve the nearer lot for hotel guests, I guess I really don't care.
Enjoy your trip!
Carol