The heavier the traffic, the easier it is for me to fight my way over to a left turn lane. In fact, the motorists seem to be much more cooperative in making room for me after I signal when it is stop-and-go than when they are going over 40 mph. On two-lane 55 mph highways I just make sure the car I am getting in front of has plenty of time to deal with that, just like I do when I'm driving 40 tons down the highway. If cyclists make a habit of doing some sort of funky pedestrian turn, then that will become what is expected and those of us who are riding according to the law will have more unpleasant encounters.