As I'm sure many will tell you, don't go with your hopes up that special extras will happen, but they often do. Just make sure to mention it anytime you book reservations--for hotel, for dinner, etc. You never know what might happen.
DH and I went for our first anniversary last year, and when we ate at the California Grill, we got a complimentary dessert that had "Happy Anniversary" written on it. We were staying at BWV on points, so no upgrades there. But I've read that it has happened.