Cycling is my main means of getting around as I don't have car. I actually find a combination of walking, cycling and public transport far more flexible than using a car. One of the beauties of cycling is that you can stop at a moment's notice and not miss the light trying to find somewhere to park.
I also feel that so many landscapes (rural and urban) in the UK are blighted by the presence of the infernal combustion machine and it's infrastructure and I do not wish to unnecessarily contribute to it. On the other hand, I have been known to hire or borrow a car or scrounge a lift although it feels very 'constrained'.