Every time we've done a Secret Santa, there weren't actual lists like you're talking about. Usually it's about five or six questions, like what's your favorite candy, what's your favorite color, what kind of accessories would you wear, what's your favorite beverage, that sort of thing. So a list for a Secret Santa? That's a bit much, IMO.
That being said, just as an invitation is not a summons, a wish list is not a demand list. If you had chosen to buy something off the list but similar, I don't think it would have been a problem. Personally I'd just be glad that someone took the time to read beyond the list to see what I really liked and found something for me rather than just taken my list of demands and picked something off of that.