Ozzage, next time you're in the Holborn peleton, quit worrying and just enjoy it. Look around you at the fixie gladiators, the Chelsea girls on Pashleys, the massed ranks of Borisers and Bromptoneers. Do we look worried about being clipped by cabs or bonked by buses?
No! Because it very rarely happens.
I have no desire to be part of any peleton. I just want to ride along, enjoying myself and get from A to B without feeling like I'm doing some kind of fitness training or sport. In the mix there I automatically speed up to match the traffic (when it's moving!), my head swivels continually left and right, I'm looking for gaps and continually judging "will I fit" and accelerating/decelerating. Sure, I can ride like that and it can even be exciting, but it's NOT particularly enjoyable unless you are the type of person who likes the adrenalin rush from it (that's not at all a judgement, but those who DO like it have to realise that not everybody does)
It's as if every commute in your car was like doing laps of a racetrack. A certain portion of the population would LOVE that, but most would find it too much hard work and stress when they just want to get somewhere.
FWIW I don't see many Pashley princesses riding sedately down High Holborn if I'm there (usually just after 6pm although I avoid it these days). Plenty of Boris Bikers to be sure though but they're a mixed bunch!