Forgive me for saying this, but you are all thinking about this in comfort with as much time as you want to think about it. When people glance around at junctions this isn't always the case. They're on auto pilot, listening to the radio, telling the kids to shut up, making a phone call, etc etc. The whole idea of Hi-Viz is that you stand out and 'force' people who are driving along without a care in the world to see you and drag their concentration towards you.
At the end of last summer a photo was posted on Facebook of my Wife and I arriving at The Harp and Crown. I ride a black bike, with predominately black clothing (which bike gear tends to be) and it was a particularly grey day. If you glanced at the photo as if you would looking either way at a junction, we simply weren't there. And someone could possibly be forgiven for pulling out in front of us stating the immortal line "Sorry! I didn't see you!".
Another picture taken a few weeks later after investing in some Hi-Viz vests is very different. You can't fail to notice us even though it was taken from a distance and there is a massive amount of other stuff going on. To me Hi-Viz is a no brainer. I get the p*ss taken out of me because of it, particularly at work. But that is a secondary concern.
