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Some of the worlds greatest artists, inventors, etc did their best work because they confronted the darkness of the world, and the darkness of themselves. And because of their darkness they had a lot to work with.
But to say that only unhappy people see the world for what it is is highly facetious. No, in fact, it's more than that. It's evidence of a clear desire to interpret your own suffering in a way that demonstrates your superiority over others, and as ploy to discredit those who spread hope and positivity.
I think it's very sad if the lenses of your world are so narrow that you can only see the depressed as wise, and the positive as dreamers, and I pity you, but don't try and sell that perverted mindset on to the rest of us.
The fact is, people use Youtube, Farmville, etc as a form of escapism from the challenges of life, which do, as you said, include confronting reality and the many negatives of it. This is an incredibly difficult task, and it's understandable that so many of us shy from it, in small ways almost every day. But it isn't an impossible task, and there are many great (and happy) people who demonstrate this. Off the top of my head Gandhi, Mandela, and the Dalai Lama all embody this truth perfectly.
And as for creative people needing depression to fuel their creativity; go watch 'Bill Cunningham New York', and tell me that creative brilliance and happiness aren't compatible.