Most people will flinch or something when they suddenly get passed closely by a fast moving vehicle.
Or urine stream.
I'm not big on announcing my presence anywhere (maybe this is an introvert vs. extrovert issue) but I try to make up for that by passing with extra care. And by completely avoiding bike paths, which is easy since there's not one within 20 miles of me. Those places seem to create roughly about as many issues as they solve.