1. Everything.
New Yorkers love walking around with headphones/hate talking to strangers, so good luck striking up a conversation with someone cute on the street.
Seeing someone cute on the subway and knowing you will never, ever see that person again.
Of course, if it's your ex, s/he'll be there on your train, in your car, every morning until you die.
Your friends are possibly even more cynical than you.
Which makes feeling enthusiastic harder than, say, drinking and complaining together.
You met someone you like who lives outside your borough? Have fun! Good luck with that!
You want me to take HOW many trains?
