I love London, sure I no longer have the hills on tap as I did in north Leeds, and to some extent Oxfordshire with the ridgeway 1/2 a mile away.
Now nearly a year into my life in London I still get a huge buzz from riding in the traffic. Bike is easly the quickest and most comfortable way around town.
I cycle commute day in day out, rain or shine, you certainly do have to keep your wits about you, and ride fairly aggressively, trying to lay claim to the same amount of road as a car does when approaching junctions etc, but being nimble and quick enough to aim for the gaps when you can. Just about all my bikes get a go on the commute at some point or another. Depending if I am after a relaxed ride in on the klein, an arsing about hopping the speed bumps type of outing on the on one, or an oh crap I 'm late...wheres my slicks effort on the road bike.
London does have so much to offer, but I can see why it scares. I used to be terrified of the place until I moved here, now living in Islington, working by tower bridge, I just see it as a privalage to experience it whilst I am (still!) young. I dont see my self growing old here!
I still love to escape the city on a weekend and go out to the hills, but living here has made me take weekends away with bikes, friends, bbq & beers more often than when the hills were on my doorstep.