I've played other characters, of course... I have three Shamans now, a DK, a Paladin, a Warlock I occasionally log onto and stare forlornly at, and of course several other warriors scattered around various servers, two of which even hit max level... but in one capacity or another, I have logged onto that Human Warrior for the past five years and run five mans, done quests, raided, crafted, even occasionally fished on him. I've done every single instance in the game on him at this point. I even did Naxx 40 on him.
He's been a tank, he's been DPS. He was even just a "Hey, guys, what's everyone up to?" toon for a few months when I tried my level best to switch to Horde. (I'm sorry, guys, but as much as I love Tauren I can't really like playing Horde when I keep running into quests that have me poisoning prisoners of war, or even my own people. I'm the kind of guy who ends up with butterflies and halo's over my head in Fable, even when I start out determined to ravage the land as a force of pure destruction.)