One of my TUAW colleagues who shall remain nameless revealed to us yesterday that he doesn't use Time Machine. "Don't talk to me about Time Machine," he said. "I hate it!"
My goodness, I thought. Is that even possible?
I cannot recount the number of times that Time Machine has saved me from thoughtless text edits or file deletions that I later regretted. Surely that has happened to you too -- you edit something in-place without saving an unmodified original. That's the way most people work. Few are diligent, methodical, and neurotic enough to save every state along the way as they work, version numbering and backing up as they go.
There's pharmaceuticals for those people. There's Time Machine for the rest of us.