Hi there!
I can't help you with the traffic questions, as we live in the Beaverton/Hillsboro area and I have zero experience with commuting here.
As far as the job market goes, I think it depends on which field you are in, so I can only share our experience.
We moved up here a little over a year ago. My DH is in the non-profit, sports and fitness, youth sports type field. He originally took a job in the development field in order for us to move up here. Once here, he started looking for a new job, as fundraising turned out to be something he absolutely hated.
Anyway, he put in his notice in January and started actively looking for a new job. Big mistake. It is now August and he has had exactly ONE interview. We've had no income since mid-March. I cannot count the number of jobs he has applied for...has been PERFECTLY qualified for, and yet does not even get so much as an interview. Not even a phone interview. The jobs he does hear back about are all pretty much the same thing: "Thanks for your interest, however we have chosen to hire an internal candidate for this position."
I've applied for a dozen or so jobs in the early childhood/elementary teaching field and have gotten no bites.
We both have college degrees, over ten years of experience each in our respective fields and have great references, but none of that matters if you can't even get your foot in the door.
From our experience, there is a lot of "Not what you know but WHO you know" mentality around here. And we don't know anyone. So that sucks for us.
But not all fields are like that. Our neighbor is an OT and she was able to quit one job and find a new one with no trouble.
I'm sure other people who have been here longer can offer you more insight. Good luck with whatever you decide!