I don't believe it is particularly to the detriment of bus users - I'm not convinced the journeys are taking longer - do you have any evidence to suggest otherwise? Also, in most parts of the superhighway, TFL have avoided removing bus lanes.
And generally - the more bikes there are on the superhighway then the less traffic there is on the road. If you'd prefer, everyone who rides a bike into London could get in a car for a day? I'm sure the traffic flow would be just fine.
Anyway, this debate is likely to go on and on, and I have breakfast to eat.
This is partly what the superhighways are designed to address - making the conditions pleasant enough to attract people to cycling from outside the current demographic.
This seems to be working.