I've done it a few times and will be doing it this year, hopefully on a fresh conversion I'm building up. It's a mess at the begining but nothings stopping you from jumping in around Central Park or so where it frees up.
My wife enjoys it and we've got some friends who aren't big bike people who want to do it and it's a good time all in all, though left to my own devices, I probalby wouldn't do it again.
Anyone doing the Montauk Century a few weeks later? Did the 100 mile version a few years back on my fixed gear but wil be doing the 66 mile this time.