When you order at counter services, show them your card before you order. Or at least before they give you a total. A young girl at Blue Ribbon bakery asked me if I had an AP for a discount. I told her that I didn't but did have a DVC membership. She just gave me a blank look. She then took my membership card and swiped it like a credit card. "Is this a credit card?" It turned out that she had never heard of DVC or how to apply a discount. Maybe DVC is Disney's best kept secret..but only from 16yo Disneyland CMs.
I did have to show my ID a couple of times. No problem. Just about every food place in DL and DCA gives the discount. (Wish we got such treatment "at home") I loved it! Especially the $14 saved at Blue Bayou.