Origamist - no offense taken, I didn't read it as a *full on criticism* but rather just more of a question.
Maybe because I'm a cyclist I read the road ahead when I'm in the car and anticipate what a cyclist in front will do... if a cyclist ahead of me signalled right I'd be expecting him/her to turn rather than just to overtake a stopped vehicle.
IMHO signalling at every overtake would reduce the impact (not the right phrase, but hopefully it's clear what I mean) of when they did actually want to turn, and I might just assume they're overtaking something and (assuming the road is clear) start to overtake them (obviously leaving plenty of room

.... could potentially be nasty!