I've often thought that, but this thread has shown me I'm simply lacking in imagination if I think I need to use my car to go about my life.
Not saying you necessarily, but I (rightly or wrongly) get the impression that some people are like Mrs Doyle and 'like the misery'. Having a car means planning your journeys around whatever suits you, whereas having to use public transport means having to make plans based on what timings and routes are available i.e. your car is your servant but the bus has a say of its own and you therefore have to 'negotiate' your plans with it.
Even if you get taxis everywhere, you still have to order them and sometimes wait for them. If they tell you '15 minutes', that's a quarter of an hour of dead time before you can begin your journey, but you can't fill that time with something else, as the ETA is dependent on traffic, other fares etc, so the driver may arrive early - and I've never yet known of a taxi driver who will patiently wait (without putting the meter on) and say "Well, it's not their problem that I'm here 8 minutes before I said I would be". They come when they come, and once they're there, you have to look sharp and be ready.
Also, to those who say that car ownership makes you lazy, do any of you have an electric washing machine when you could simply use a dolly tub and mangle if you weren't so 'lazy'? Do you ever buy potatoes or carrots from the supermarket/greengrocers, when you could grow your own if you weren't so 'lazy'? Do you ever sit and watch the telly when you could otherwise simply perform your own hand puppet show to entertain the family?! 
I fail to see how securing the use of a brilliant, revolutionary, purpose-designed tool to do so many everyday jobs in the quickest, easiest way possible is automatically lazy.