"Until you do so, security updates may not be fully applied, newly inserted or supported hardware may not function and new services may not be available."

To be fair, there was a 107 updates. I didn't check if one was a kernel update so I can't say if there was or wasn't - while this should be the only situation where a reboot may be necessary, the above statement from the updater... I don't know. I guess I just got scared that they were trying to Windows-ify it. I'm still shaking.
-m