I would have to say that I'm not at all impulsive. I'm in a job that can at times require a quick response to things, as others have noted, it's not the same thing. Spur of the moment impulses are rare, although I can usually suggest something crazy, like going out. However, if the other person, say, takes too long getting ready, then I'll nix that thought.
I find that stress can also be a motivator for being impulsive, at least in me.