> Is there a single developed economy that doesn't make significant use of trucks and cars?

You do not even need to restrict it to developed economies. Every city (even not very large ones) I have been to around the world, developed or not, has streets lots of cars: London, Manchester, Paris, Nairobi, Colombo, Madras, Bangalore, Sydney, Singapore..... and smaller towns and rural areas in those countries too. Those cover a pretty wide range of quality of public transport too.