> Unless you are in very heavy traffic, forcing people to go slow or worse to pass you on the right is causing a much larger safety issue
If traffic is heavy in all lanes, I think most people would agree you just need to relax and go with the flow on a highway. That applies just as much here as it does on the Autobahn in Germany.
However, if traffic is not heavy - Oregon like California is a "keep right" state - so if you are in the left lane and someone is coming up behind you, you need to yield - regardless of the speed limit.
It's not just the law, it's also the safer thing to do.