Living in a big city can be amazing and lovely and cool. Plus you have the bonus of nonchalantly saying “Oh, I live in New York/Paris/London/Hong Kong/Los Angeles” to old acquaintances. That’s cool at the start, but like all big cities, the magic wears thin. Everything is busy and loud and angry. Public transport sucks what with all these people here. Same goes for a car commute. Slowly you become one of these busy, loud, angry people.
That’s why vacations are great. Unless you end up moving to that vacation place and it just becomes another place.
Hurrah pessimism! But yeah it’s fun living somewhere big for a while. All the cool stuff arrives there first.