Quick, without researching the information (and without actually posting the answers here, because we don't really care either)...
* What's the population density of YOUR home city?
* What's the population density of any single 'major' city on the other side of the world from where you live?
* How often to you actually think about the vast number of people directly near you (or not) as you drive to work each morning to earn your weekly owlbear-slayer salary?
* Do those numbers make your life any more or less "real" to you?