Midtown Manhattan absolutely still gets this crowded, especially near Times Square and K-Town. Like other commentors are saying, it really depends on the location in NYC, time of year, and time of day.
Also, if a shot in a film doesn't feature an actor interacting with the set significantly (having conversation, looking in store window, etc.) there's a decent chance it's stock footage of the actual street conditions.
There's a reason New Yorkers hate going to Times Square :]