For each boss's boss where I work, there are about three hundred customer service personnel, billing specialists, and collections workers (and there are many boss's bosses), each of which has two monitors, manipulating at least three applications at once with the leads having three monitors because they need to monitor call center status, automated billing processes, etc. (yes, newsflash: there are people in the world who have to constantly monitor things and thus need something on a screen all the time).
Every single one of these people doesn't know the difference between their three monitors and their towers and probably will forget their password by the time I go to work tomorrow. They sure as hell are power users, though, and there's no question that they utilize the full capabilities of desktop Windows.
Folks need to stop thinking "power users" is another word for "computer science majors & IT administrators" - -especially since the "power users" are actually mostly in non-IT departments.