Obviously some people are going to be rule nazis.
My perspective is that I only signal if I believe there is benefit in terms of collision avoidance from signalling when changing lanes.
So if I am changing lanes and am going roughly the same speed as the car in front of which I will be merging, then I will signal, because he needs to know he should not close the gap.
If I am changing lanes and there are no cars around, I don't signal.
If I am changing lanes and there are cars around, but I have several car lengths between me and the car I will be merging in front of, and I am also going significantly faster than that car, then I won't signal because there i no danger of him hitting me. In this instance I don't signal because I don't need him to give me space, and it also doesn't pose risk if he were to press the accelerator while I am merging.
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