I would love to visit New York, but the point I'm trying to make is that I didn't see enough of it on screen to warrant filming there. And the shots of Central Park did look devoid of life.
Watching the opening again, I'd say theres at most 5 shots which NEEDED to be filmed in New York, and any of the rest could easily have been faked in post, and to be honest probably were.
Doctor Who isn't set in New York every week though, and won't be again thanks to that little line of dialogue about if he went back in the Tardis it'll be blown up. Soo...what was the point? 5 shots of Rory holding coffee walking through a park? Theres a few in London that could easily have doubled for those. I just don't see the money on screen like I'd expect an episode filmed in New York would look like.