What exactly are you basing that on? Not snarky, I'm truly interested since I fit the OP's description fairly well; luckily including having quit in December 2012.
Actually, I've never had a sign of ADD. I don't lose things, have decent impulse control, can pay attention for long periods of time, don't job-hop.
Heck, I homestead and adore the films of Andrei Tarkovsky. :)
I don't lose things, have good impulse control, can pay attention for long periods of time when something is interesting, and I don't job-hop ... but I sure as hell have ADD and take Aderall for it.
It has solved so many problems for me. I can focus on menial tasks that I used to dislike with a passion, I can work for hours on end without getting distracted in the open plan office, I no longer have issues with not finishing projects (although one problem I do have is working on too many at once ...) and because of the aderall I no longer feel the obsessive need to speed while driving (which is actually a sign of ADD).
Just because you don't have the ones that most people consider to be associated with ADD doesn't mean you don't have ADD. I used to use caffeine as well to be able to work and focus, when I stopped that my work suffered but I was sick and tired of the side effects from caffeine. Aderall gave me my sanity back, and work ethic. I am having a much easier time getting stuff done and not procrastinating.