I think a lot of cyclists get a rough deal and a lot of car drivers need to learn that cyclists are actually allowed to be doing things like riding two abreast, turning right, etc. etc.
However, car drivers have (at least in law) to pass a test and be insured.
Cyclists do not.
So no, I don't feel that brilliant about seeing numbers of cyclists 'instead' of drivers. I worry that they're cyclists who shouldn't be on the road at all. This is often the case because, like mavis, I'm in Oxford which is student central, and many cyclists are teenagers who have no clue about the rules of the road.
At the moment, in order to get to my house I go over a bridge where traffic is controlled into a one-way system with traffic lights. There is also a pedestrian footpath beside it. Many sensible cyclists use this system fine. Many other sensible cyclists, who are slow because it's up a steep hill and they're cyclist at rather less than walking pace, choose to push their bikes up the footpath instead (I'm not saying anyone should have to, just explaining that there are options).
And some twits run the lights.
On a one-way bridge.
Where there is literally no space for the bus to get out of their way.
The other day I came up behind two cyclists who had met going opposite directions on the bridge, who'd stopped to have a chat.
If those are people who could be in cars, I am thanking god they're not, I can't begin to imagine how dangerous they'd be.