I have a funny story about my new fridge. My old one was 35 years old and I had to defrost it manually.
I got the new fridge in December (Aussie summer) so I was continually using and refilling the ice cube trays. I had left a couple of trays in the freezer during winter but wasn't using them and then one day I noticed that the ice cubes weren't to the top of the tray. I just assumed that I might have spilt a bit when putting them in the freezer. Then they were only half the size. And I then realised it was because of the frost free freezer. It was doing what it was meant to do.