I've never been depressed. I've been Sad plenty, but never depressed. I think the word "depression" is overused in today's society- so much so that it is dismissive of the true disease.
Medication is sometimes necessary to treat true cases of depression. But doctors today are so readily handing out zoloft and prozac, that it's become almost vogue to be one some type of mood lifter. Therapy, however, can be enough to help someone who is dealing with mild depression or is unable to handle their emotions. Shoot, we could all probably benefit from some therapy at some point in our lives.
I would need two hands to count all the people I know who've been on some kind of drugs for depression. And I doubt half of them really have chemical problems in their mind.