Caselaw still disagrees with you apart from in a very narrow situation.
http://www.motorbikestoday.com/news/Articles/filtering_law.htm
Filtering on motorways, dual carriageways or in anything other than very slow moving traffic is still entirely the bikers responsibility, exactly as it should be. No driver should have to not only watch the legitimate lanes, but try to guess where bikers have made extra ones as well.
but this was slow moving traffic, it was stationary traffic, so whos responsibility is that?
Every road user needs to check there surroundings not just lanes. i.e something at the side of the road, just because its not in an "official" lane dont mean you ignore it.