Meh. I commute by car and DH does because it's much much easier and much cheaper than trying to use the train/buses. Not that he hasn't tried, it was a disaster. I can't as I work rurally. Even when he goes back to uni and we're back down to one car I'll still have to pick him up from work as it'll take him an hour to get home otherwise (20min drive for me).
It can also be cheaper to hire a car for us rather than taking the train when travelling from Sussex to Essex, which is fucking ridiculous. By coach it's cheaper but it's very hit and miss on travel times.
We live 3 miles from our city centre, the bus is almost £5. Walking is an option but bloody difficult (big hills, especially for those of us with health issues), especially if you only need to pop in. It is cheaper to take a car and park for 2hrs than to take the bus. It is bullshit. The bus also doesn't like to turn up. If you have an appointment in town then you are fucked.
I think OP was looking for a bunfight as she tried to start one on a thread about what car to buy and was told to go start her own thread. It is a topic worth talking about though. I don't think people should drive unnecessarily, though I'm guilty of it myself as we all are to a certain extent. If I didn't live halfway up a 2mile hill I would probably walk more, my gym is at the bottom of the hill and I daren't walk the distance for fear of not being able to get back up.
Public transport is stupidly expensive in my area. When I visit my family in Essex I have to take my car, even though I could get to my Mums by public transport I couldn't visit my old friends or my MIL (they live in a town a 40-50min bus ride + 15min changeover on a dodgy corner in the middle of nowhere away, or 20mins drive). It's still much cheaper for me to take my car than it is to get the bus to the station, get on a train, get the tube and get another train. I also don't have to worry about replacement buses, finding a seat, waiting for my next train, getting onto a train with no toilet and so on.