I stay in the queue of traffic, just as if I were a car.
I think it somewhat risky to ride down the middle of two lanes of cars! Way too easy to get doored, or caught in between lanes if the light changes to green.
If I'm turning left, I signal and move into the left lane early and again queue in, seizing the lane just as if I were a car.
To me, the issue is safety. I ride in alot of traffic on my 12 mile commute each day.
Sometimes the cars will pass me and shift back into the lane cutting me off before a stop sign, and I don't mind riding past them while we are waiting on the light or stop sign. If they look particularly psychotic, I might not try that, but it is a quiet way of saying: "Yo fool, you cut me off!"

So I guess I'm willing to takes some risks, or I wouldn't be on the road in the first place.