Yes, git stash is awesome! I use it all the time to "snapshot" my WIP and/or to quickly get a clean working tree when taking an interrupt to work on something in a different branch. (`gs` alias for `git stash save -u`, along with `grs` for `git reflog show stash` -- which shows the commitish for each stash...)

I see the stash as kind of like a private remote, in that I can freely put whatever messy or experimental or half-baked WIP I like, gaining the benefits of a commit without inflicting it on anyone else.