Yeah I had a hard time getting that around my head too. I was so used to doing things on my computer to keep it in shape and keep it productive...now it's like...I don't have to do anything, and it keeps the productiveness. Win-win.
I mean, even after 4 days of uptime, there is NO slowdowns whatsoever that I can notice...only my page-outs have been a bit higher than they usually are, but even then, my machine doesn't show any signs of bogging down. My PC would always have to be restarted at least once a day to keep things fresh.