It's useful enough that it's made it onto my "small" keyring rather than the "big" keyring that I leave behind if I don't have room.
My setup is starting to sound like yours. My keychain rigs are changing. Again.
I used to have car keys plus gear and house keys plus gear, both on separate keychains. Now I'm veering toward house and car keys on one keychain, and gear on another keychain.
-- Craig