It sucked. I was a mile or so away and saw it all happen. I remember a middle-eastern guy crying laying on the ground saying "THIS IS NOT WHAT GOD WANTS!" I remember another guy mumbling to himself "well they got us good this time." Mostly lots of crying and screaming when the buildings came down.
Mostly I remember the months afterward when traveling people would go out of their way to be nice to me when they found I lived in NYC. It was really nice!