I don't wear Hi-Viz while cycling, but my lycra has a fair amount of reflective brand advertising that I'd prefer was just plain reflective strips. The biggest difference I have noticed recently to my general sense of confidence is the subtle adjustment of my riding style which primary position has given - after following links about the subject on here. The number of cars accelerating to overtake me and then braking at a traffic island, for instance, may increased but, so far, no irate hooting. It's my contention that this sort of assertive attitude to cycling far out-ways any kneejerk political remedy to cycling injuries/fatalities.