As a former CM myself (at WDW and at a Disney Store) I can tell you that I never heard about guest cards that were positive. I did hear about letters though, and I still have one that was written and keep it as part of my portfolio.
I got married under the gazebo on the boardwalk and our wedding was around 3k. Disney supplied a planner for us, cake, limo, violinist, and we even got a watch set which was a surprise. We didn't have a big wedding, just immediate family but it was great.