Read that the reason why the name was stuck to New York City was due to the major horse race tracks being in the city 'back then'. So when a horse is due for a race in the City, it's like it has hit the big prize and is going to the City to get the 'Big Apple' - prize. Got that from Lonely Planet.
Anyway, the main thing I noticed about New York City (NYC) is that everything is huge - the buildings, the adverts, the vehicles (4WD and Space Wagons are the main vehicles plying the streets), the Subway, the police (most of them are 'plus size'), the portions of food... and the amount of tip that is expected.
Well, look at it this way, the national sport for England is football and that of America is American football. Go watch an American football match and you'll know what I'm talking about. While you're doing that, please don't mistake the rugby with American football.