Edit: if you are going to freeze something then using liquid nitrogen will do less damage than a normal freezer.
Righto, that makes sense.
Many years ago at a press event held by the Nat Geo TV channel, they made ice cream using liquid nitrogen. It's a nice party trick, and it does give very good results (the small ice crystals thing - makes for a very creamy texture), but it's not something I would ever go to the trouble of doing myself.
That video certainly put me off the idea of trying it as a method of preparing steak.
Just off to alibaba to buy a sous vide cooker and flame thrower though...