I can only speak for myself, but I am certainly "real" and so is my depression. I'm sure that it can seem a little monotonous, but it's pretty damned shitty for the person who is suffering, too. It's not just a case of needing to snap out of it, or letting spring revive your spirits; depression is about much, much more than feeling a bit down.
I have actually stopped posting on my thread because so many people were commenting on the depression threads, and I don't want to be seen as an attention seeker or as a liar, and I think it would be an awful shame if other people were made to feel that they shouldn't be posting because it was seen to be disturbing or depressing to others.