Same here. I had long highway commutes. Never had any kind of issue lane splitting in Ca because it's expected by drivers -except those newbs from out of state that continue to frantically switch back and forth to dead stopped lanes of traffic. They are easily avoided though.
Much more dangerous to bikes is the left hand turn from the on-coming lane.
That’s one thing I think the cagers don’t understand. Bikers ... and in particular ...bikers who are splitting lanes have a greatly heightened sense of the traffic. We usually see 10 or more cars down the road. We can see the guy who might suddenly change lanes before we get there. We can see the accident getting ready to happen from 100 feet away. We can avoid most incidents with mobility ... it used to be even better without helmets. All that advantage goes away when we have to sit in traffic and risk getting plowed into by a rear ending un-alert cager. I would rather risk that cager on the move than be a sitting duck for him