I haven't used carbon in my tank for more than a year now. I agree that most of the debate revolves around it being inert after a couple weeks, and people not changing them. Thus, in a sense, they aren't running carbon either (after a couple weeks or so). I don't see any point to spend money on replacement carbon packs, that dont seem to do any good for me, at least. I would only consider using carbon after medicating my tank (which I haven't had to do, thankfully).
"... if any one specie does not become modified and improved in a corresponding degree with its competitors, it will soon be exterminated." - Charles Darwin