If you want to sit in a sidewalk cafe, pick a spot and sit down. Eventually someone will come out & bring a menu. They won’t rush you to leave, even if all you get is coffee (within reason, like an hour or so). They won’t bring the bill (“addition”) until you ask.
Lunch really can take three hours.
The metro is easy once you try it.
Most doors are Push.
When a waiter comes on shift he goes around & shakes hands with all the other workers. Being a waiter is a respected career, and it shows.