I've been safely splitting lanes in CA since the 70's. Even though it's now officially legal, that doesn't mean the cagers are excepting of it. Yeah, there are some riders which split traffic at ridiculous speeds, but frankly, it seems like some cagers have negative views of motorcycles and just hate us no matter what. I've been close to being run off the road by angry drivers as I just rode normally.
It may sound weird to you folks that don't view lane splitting as safe; I regard it as part of my defensive riding. I don't feel safe riding in groups with cars at all. I want to get past cars as quickly as it's possibly safe. I also feel very exposed at the tail end at an intersection, and will always filter to the front.
Unfortunately, I have always told my friends that ride, to ride as if the people in cars either don't see you, (especially, watch out for left tuners at intersections) or they are out to get you!