I was raised in Seattle and have also lived in Idaho, Montana, and Nevada. I would never, ever move back. People are rude, it's difficult to make friends (it is a very cliquey town), the weather is crappy and the traffic is worse. Going anywhere is a giant problem. The cost of living is unbelievable. We own a home in Idaho and Nevada, yet we couldn't afford a SINGLE home in the Seattle area. Rent for a 1 bedroom 800 sq ft apartment was almost 1600 a month, and that was in a crappy area in the suburbs.
The only redeeming qualities are that the scenery is beautiful and green, there are thousands of hiking trails, multiple skiing areas, and thousands of miles of bike trails. The outdoor recreation possibilities are endless...so long as you don't mind doing them in the rain 7/8ths of the year.