FWIW I don't think that's a bad exercise at all. I think Soltis recommends something like that in his "Inner Game of Chess" book. (just doing it once, he's not saying to do it all the time).
I think it will have diminishing returns, but I think it will help improve your visualization. Lets say every day for a month you visualized one full game all in your head by using the notation. IMO that's great. You'll probably want to move on to a different exercise after that though.
Thoughts? Anyone else do this?