We have never received an upgrade at WDW but our one cruise we got upgraded quite a few levels. We got a balcony and there were chocolate dipped strawberries and other treats in our room when we arrived. I even called to make sure we were in the right room.

It was a year or two after 9/11 and a lot of the passengers had used passes they had given out (either their cruise had been ancelled or cut short) and had filled the lower decks. We had booked our cruise a year in advance and just lucked out with the upgrade