Those of us who work for a living often need a car. I, personally, couldn't physically do my job without a drivers license and I wouldn't be able to do extra stuff (Like drop by schools on the way home) without my own transport.
And fuck being out the house by 7:00 and home at 5:15 - I couldn't keep that up. Maybe it's different if you haven't had/got a car - but I simply couldn't live the life I do without one. And most of the people I know who can't/won't drive spend half their time getting lifts from those who can.
I don't use it because public transport for me means a bus into my town centre, another bus back out again which then stops at every small village on the way and which takes about 45 minutes to get me to work and which drops me off a good 10 minute walk from where I work. And overall the journey to and from work would cost me about £8. So with waiting and the first bus and all the rest of it, you're looking at about 1 hour and 15 minutes in total from leaving my house to arriving at work.
Whereas driving involves a 15 minute drive along a dual carriageway (it's about 12 miles to where I work), I don't have to go anywhere near Darlington town centre and I get free parking in a big car park which is a 30 second walk from my office. Plus I can get about 350 miles out of my car for £30 of fuel, which means that a trip to and from work costs me about £2.
So yes. Public transport is /really/ viable for me then. 5 times slower and 4 times more expensive. Woo!