Guilty as charged. We do box step in rumba, Fox Trot, Waltz in American style. So if someone asked me, I would first wonder why they were asking, since it is a basic you first learn. But I would definitely say yes.
I like the fluidity and steps in International style, but not many folks around here teach it or dance it in a social setting. I would describe myself exactly as acoyne4521 posts -- I pretty much do whatever I want in a social setting and stick to the task at hand in the studio or when doing a routine for a show or program in our community. I would guess that describes most of us.
Long live the box step.