I do the same thing as the OP, and maybe or maybe not ask WTF of the driver. I will say that many times when I do that, the drivers who are making the right turn will give me a wave of 'thank you.' I have, however, had drivers pull up beside me thinking that I was making a left turn because I'm occupying the center of the lane, and then going straight as light turns green. I am usually aware that the driver has no intention of right turning, and when light turns green I am usually faster off and through the intersection before the adjacent driver is. I've never had any problems with this.
It's the same with driving. If possible, I'll position the vehicle as far left as possible so right-turning vehicles can make their turn. Again, I've gotten lots of friendly waves of 'thank you' from drivers. It's just simple situation awareness.