ADHD is lots of things. I'm uncontrollably curious, quickly bored, scattered, quick to anger, all of that. I was diagnosed with ADHD quite recently, and though it's still uncertain there are parts of the diagnosis which are indisputable.
Also indisputable is the knowledge that my "type" would be quite useful to a nomadic group -- constantly moving, seeing new things, dealing with dynamic challenges; this is a context in which I thrive, and its absence from modern life is what renders my state a "disability."
Even now, the way my mind works seems innovative and fresh to me (and sometimes to those around me), and I think this disability could be harnessed more effectively by our highly regimented society. Instead, we try to educate and drug it out of kids, and shame it in adults. How much innovation do we lose this way?
But that's just an aside. In reality, I have to deal with my lack of focus everyday, and the consequences are apparent whenever I measure my potential against my actual.