I'm also thankful that even after two years, we are still civil and polite with one another. Yes, we still say "thank you's" a lot and show our appreciation. I do agree that you can be completely open with your family, but I don't believe that it means you lose your civility because of it. Family is for you to love, not for you to use and take advantage of.
Oh, and I also created the print below last week to remember the important dates of our lives. It's currently hanging in our toilet room. :)