S.L.
I LOVE Long Island! Love the people, love the proximity to NYC, love the large lots and (mostly) pretty houses. Love Dunkin'. Love that I can throw a rock out of my car window and hit about 10 places where I can get decent salami. What's not to like?!
Drawback: the snow. Yuck. Cabin fever in the winter. If you spend a lot of time outdoors, year round, consider that carefully. I'm Calif born and raised, and the weather is the only reason why I will never be a New Yorker. If that doesn't bother you, I say go for it.