The only time I use turn signals is when I'm in the middle of the road trying to make a left turn where it doesn't look obvious or when I change lanes from being on the right side of the road trying to get to the left side in front of cars behind me.
I go so slowly at stop signs that my bike position really tell others where I'm headed.
I'm not so good at braking, signalling and turning my head all at the same time.