Yes, I've been through Seattle quite a few times. There are very distinct modes of separation that are very noticeable, where the barriers are not obvious. No visible walls separating ghettos, or various minorities and whites. Go to the right places at the right time and it is very much apparent.

edit: There was a street downtown near Lake Union when I had to work for a client in their Lake Union offices. On my way on a late night project I happened to drive right along one of these 'corridors'. It's not Pine/Pike, but further North and South of Lake Union. It was basically an entire row of street blocks that acted as if it was an invisible barrier. It was very noticeable there, and elsewhere as well. I think it's a new type of policing strategy.