In my OP I stated I carry the APs and TIW because afaik their discounts are equal or better to what we get with the DVC. We've been here half a week already and the only time it was to my benefit to use the DVC ID was to purchase the APs. I wasn't trying to just use the MB, but just to see if there was anything else I might need my DVC ID for, Thank you all for your responses but I think the only thing mentioned that we might do ( and need the DVC ID for) is TOTWL, and since we are here at BLT that is no big deal.
There are a few places where the DVC discount is better than the AP, but they seem to outnumber the times that the AP is better than DVC:
Dining Discount Comparison:
http://allears.net/pl/disc_dining.pdf
Other Discounts comparison:
http://allears.net/pl/disc_other.pdf
DVC Discount is offered or better:
Givenchy
Guelain's
Basin
All golf courses
Golf lessons
Aerophile Balloon
Richard Petty Expereince
Surrey Bikes
Tennis Lessons
Floral Experience
AP discount is offered, but DVC is not:
LEGO Imagination Center
Disney golf shops
BASS Nitro Fishing
Splitsvill Luxury Lanes
Alamo car rental
As for dining, there are no cases when the AP discount is offered or better than TiW's offering. There are, however, some restaurants at the Swan and Dolphin that offer a DVC discount, but no AP or TiW discount:
Picabu
The Fountain
Fresh Mediterranean market
Cabana Bar & Grill
Splash Grill & Terrace
Since your DVC ID is required for Top of the World access, and the DVC discounts are more and better, I'd carry my DVC ID before and AP ID, unless you frequent one of those few places where DVC doesn't get you a discount.