Mike,
I agree that Seattle doesn't have the type of working class food you are used to. The ethnicities that have shaped Chicago and Seattle are much different. In the PNW, you can find outstanding Mexican food (taquerias), asian food, scandinavian food (seafood), and coffee (cheap and expensive) right around every corner. There is essentially no Italian influence on this area, so you are right in saying that you can't find good sausage, Chicago style pizza, etc.
Regarding leftover parts of a salmon, that's what salmon chowder, fish cakes (scandinavian), fish-ball soup, caviar, etc are. You are right. It is an art figuring out what to do with the left-overs and a Chicago (Italian) sausage is light years ahead of any hot dog you'll find around here. I doubt it is easy to find a good cup of clam chowder in Chicago though.
--Craig