I did it on my Speed TR. I was completely unprepared for the morning chill, and my legs were shivering by the time I finally started riding. I may have been lucky, but other than the beginning and the end (at the ferry), I only had to walk and/or stand at the bottleneck to get into Central Park. Riding through the park was nice, but I'd rather they plan a route that goes around it so we can stay on wide streets and avoid that bottleneck. (Of course, I also had to walk to get through the rest stop at Astoria Park -- it was pretty annoying that we couldn't bypass the stop but had to walk through the park.) And I felt like the Queensboro bridge was steeper, but the Verrazano was much longer.
My computer died near the beginning of the ride, so I have no idea how fast I was going most of the time -- but I did find myself passing lots of people, which was gratifying. All in all, a good time, and I hope to do it again next year.