At least for druid we're not THE leader of the class. Instead we're part of the council of archdruids. Along with Keeper Remulos that's what, 5 other druids? And it seems clear I got there by being the guy who gets stuff done in the field, not for leadership necessarily. I haven't done any other classes except DH but the druid campaign gave me very much a feeling of being part of the whole cenarion circle.