We had a WDW wedding in 2007, and have been back every year for our anniversary since then. We normally get the anniversary buttons and a few times we've received a free dessert or something, but mostly just well wishes from passing CMs. The only exception was our one year anniversary. We had some MAJOR things go wrong with our wedding, so we were blessed with a few free room nights as an apology (never asked for it, Disney insisted.) Just have a great time and any blessings will be a welcome surprise. If you go expecting something you'll very likely be disappointed.