I'm one of them!
Problem is, if you take the medical model away, sociey delegitimize the problem. If you're not “clinically” depressed, then you must just be lazy. Saying it's a “disease” is a way for it to be taken seriously, as little as it has to do with traditional medical diseases. As a result people cling to medicine as the only way they can be taken seriously.
I don't think I've ever said anything negative about psychiatry to net positive upvotes.