I've never stayed at the New York, New York, so this review is for the main level which includes the casinos, restaurants, etc.
I'm from New York myself and I have to say I love the restaurant level with the cobblestone walkway. The restaurants there are always crowded but they're all definitely NY themed. I also like the piano bar which also gets crowded once the music gets going.
I've never tried the roller coaster there, so I'm definitely gonna have to go back!