I agree with Mimi,
only you can decide what would make an anniversary cruise special.
We've been on all 5 dedicated Member Cruises so obviously we enjoy them. We don't go for the gifts (though we've gotten some nice ones over the years). What we do go for are the guests. Still what is a great guest to one person might just be an ok guest for another. This year we really enjoyed the Imagineers they had on board, plus Ducky and the Broadway ladies. The sports inspirations didn't do as much for me though their presentation was good.
We love Disney history and that seems to be the one thing that has always been a part of the Member Cruises. From Art Linkletter who was at
Disneyland on opening day, to Roy Disney (enough said), to Marty Skalar. All these and many more have been part of past Member Cruises.
As Mimi also said part of what makes the cruise fun for us is the great group of DISers we sail with. Getting to know each other before the cruise and having friends all around the ship. That really adds to the experience. It isn't for everyone. Some want nothing to do with a large group and that is fine as well.
Bottom line if you go in with super high expectations you might very well be disappointed. If you go into this or any other cruise with the expectation that it is going to be a special one for you and your spouse than you can find and make your own magic.