As another PDX'er I tend to agree. I see plenty of X5 3.0i's around here, not really anything higher than that but the occasional 4.4i. But they are common around here as any Subaru, Toyota, or whatever car.
Everyone always experiences the occasional angry driver, but I often wonder is the driver of the BMW driving differently than if he was driving a Toyota?
In Portland I more experience the individuals that want to race me off the stop light with their Civic's and Integra's. But nothing more than that.