I don't think I've ever ridden on south carraige road. Although Park lane isn't a bad road, 3 or 4 lanes of usually pretty briskly moving traffic.
I don't think west carriage drive is that bad either. The problem is and always has been suicidal pedestrians walking across the road through, stationary traffic without looking.
I don't mind riding through town and if I am honest, by far the most dangerous things are the mopeds. No mirrors, no lifesaver checks, no idea and always in a hurry/race. I think the CBT is a bit of a joke.
The cycle super highway doesn't really bother me as long as they let motorbikes use the bus lane's and clearly sign post any restrictions.