True, I always ride like people don't see me, and I think I "pee" off the people behind me by slowing down at interesections, or side roads. If I see someone who seems to be creeping out, or looks like they see me, I'll just wave at them or honk the horn or something to get their attention. Again, I think this annoys people, but I'd rather annoy people than have them hit me.You've pretty much said it. It's like when you buy a certain type of car - suddenly you see the same car everywhere you go.
No matter what I'm wearing, I always operate with the assumption that I'm not being seen by anyone else. I think more reflective material is a good idea for night riding, but other than that I think the difference with wearing bright colors during the daytime would be negligible.
Cheers,
Loonette
As far as the vest, I don't think it will help too terribly much, but I want to to take any help I can get.