Monthly Mac Maintenance, really?

Ran across this in the blogosphere. Is this really necessary? I have not done a thing to my Powerbook in 2 years and it still performs as well as the day I got it. Not a single kernel panic either<knocking on wood>. Unlike windoze, a yearly reinstall is not necessary to maintain top performance. No registry either, I wonder if there is a connection.....

I'm proud to say that I have been windoze free for almost a year.