I think this review is actually depicts the movie and its meaning quite accurately. The taxi driver does live in a different world because he sees a different world - he works all through the night when the danger and not so glamorous lifestyle of NYC emerges. He experiences things that typical "day time" New Yorkers don't. In a way, it can be said he has it harder than most because he lives through the filth and the dirt and is forced to communicate with a great number of people, some of which are pleasant, but many who are often not. It would be interesting to be a taxi driver for a day, and get a whole new outlook on the city and its residents.