Well, re-installing is a pain, but sometimes necessary. Better to do it BEFORE all your stuff is in the way.
Also, you don't really need to power a Mac down every day. They sleep and wake reliably, and that's how they're intended to be used. (The only reason I would shut down daily is if I had very unreliable power.)
Or, do what I do: leave it on full-time so just the display sleeps, and run Folding@Home 🙂