I know that many people in London (UK) don't drive. In big cities it is very easy to rely on public transport as it operates pretty much 24/7. There are always buses, trains, trams, the underground, taxi's, etc. Thinking about it, and I am thinking of London here, it is much easier to get around WITHOUT a car because the traffic on the roads is terrible.
Because I live in the country that really spurred me on to learn how to drive as soon as I hit 17. Although I haven't been driving for all that long I couldn't imagine not having a car now.