I grew up in Manhattan too and can't believe the RADICAL changes!
I never ever thought that I would live to see the day when Times Square and the surrounding area would be cleaned up.
I couldn't have ever imagined that the THOMPSON SQUARE PARK area would EVER be cleaned up either.
Slums and elegant neighborhoods have always been in constant flux, in Manhattan; however, in all of its history, they were switched...what was once "elegant" became slum and what was once an OMG..YOU DON'T EVER WANT TO LIVE THERE, became elegant. Now, slums are being pushed outwards to the suburbs, as N.Y.C. just become nicer and nicer. *shrugs*
NYC is the closet thing to Paris America has. Boston and SF are runner ups.