In Massachusetts here. I use them at least 95% of the time. I suppose if it is an empty road and I'm SURE it is empty, I might forget, but I almost always use it as an automatic movement. I'm originally from Florida btw.
A bad habit which many New Englanders seem to have is that they DO use their "blinkahs" but they wait until the very last second before turning, or sometimes turn it on AS they are turning - like, in the middle of the turn (I envision as the hands turn the wheel, it just happens to go past the stick and that's when the blinker gets hit). Drives me crazy!