I live next a principal street so I can hear cars and buses all night long and about six am I woke up just for the noise of people moving, so I get used to it but it is very uncomfortable when at 7 am they start being rude to each other. This is one of the things I really do not like about so many cars in the city, even sometimes people use their cars to move a block from they are.
I think we might be depending to much on cars sometimes, maybe not all population can develop this depending because of the money and ages (kids and old people can not drive them) but it is a fact that in all big cities we have cars to transport and that is, at least in Chile, a symbol of status. Maybe that is another thing that made us depend on cars, and obviously because they are the faster way to get anywhere most of the time, and if it is not is always the most comfortable.
Following this last ideas I think that they are a great invention as a toy and as a transport, very usefull for people who work until late, for when you have kids, have to carry around a lot of things or for people who travel a lot. Another great use of them are the creation of taxi services that now complement with cellphones technology to be safer than before.
To conclude, I think cars are a great invention but that we need to think in ways to use them better to save natural recourses and to make them not a problem, like the noise and screaming in the morning or evening, but a less complicated solution.