I've answered your question on another conversation, so here's my second example: I've borked my system last week doing some forbidden incantations. I've then restarted, chose a previous revision on Grub, and there I was with everything just the way it was before.

On another distro, that would be at least a day of work lost setting up stuff.

EDIT: lol I've replied on the wrong comment, at least it's the same author...