"....think we live in a time when we no longer accept deep melancholy and really quite severe distress as being within the normal range of human experience......"
It is a common misconception that depression is the same as sadness/distress/melancholy, when it is so much more than that. For me, depression means my life is lived in shades of grey, no motivation to do anything, little or no anticipation or enjoyment from normal activities or special occasions, bone-weariness, inability to sleep properly or take care of myself properly (some days it is a battle just to get out of bed and see the children off to school, and a shower is beyond my capabilities). And that's the good days - on the bad days, all I want to do is to fall asleep and never wake up. I am on antidepressants, and am not having suicidal thoughts, but I do think about death, and look forward to it.
It is definitely more than being a bit "....low/cross/nasty/bitchy/tired/worn out.....!!
I have had depression since I was bullied in my mid teens, though that only became clear to me in the past couple of years, when a psychotherapist told me that it is not normal for a teenager to plan their suicide.
Depression has come and gone for me over the years since, and I was first formally diagnosed after ds1 was born, when I was diagnosed with PND - in hindsight, I suspect that it was probably a mix of depression and PND, and that I was predisposed to get the PND because of my history of depression.
Did I/do I want a label - yes, I do - because having a label means I get the treatment that I need, and that means that there is hope that I will eventually beat this - I may one day live a normal life, where I can enjoy things, feel positive emotions, have the energy to look after myself and the house, regain my sex drive - things that moondog probably takes for granted.