I do it sparingly, but always (when its safe) at a certain fairly lightly travelled intersection where I am going to make a left hand turn one block past the intersection that I go straight on the left turn arrow.

The intersection is at the beginning of a wide 4 lane street with a median, that is posted for 30 mph but after this intersection, the traffic flow is closer to 50 mph. I go straight on the arrow and I have made my left turn before the traffic in back of me has even started to move.

The less traffic that tries to overtake me the safer for me.