Picking up and extending just a bit on this:
I don’t have a single piece of software on my desktop or notebook that has been configured to automatically update itself.
For most Linux users, auto-update for security / critical fixes is no stranger in the case of individual apps. For Windows users, there's Secunia PSI (free, as in 'free beer'), if you care to look into it. I think it's a great concept, and recommend it. Non-disclaimer: I'm not affiliated with them, beyond being an appreciative end user.

Bottom line, auto-updates should be common, not exceptional. Certainly for WP I think it's pure win.