IME, the first people in my friend group who started doing it were the ones who weren't insecure about looking "uncool" (so a combination of unapologetic techies and people without low self-esteem). Afaict, that's the main reason that people don't use a feature that would otherwise save tons of time.
I'm not afraid of being seen as an uncool geeky, but I would never use it as I don't like to broadcast what I am looking for to all my neighbors, even when I am alone I prefer silence, typing now requires basically the same amount of time.
