Our road trip to St Patrick’s Cathedral was very interesting.  There was no line and no fee, just walk in and look around. They let you take pictures in most places but not when you get to the front of the church so keep that in mind. It took us about 15 or 20 minutes to walk through the whole thing .  The crowd behaved and everyone was respectful.   The cathedral gets over 5 million visitors a year!  Check it out on your next road trip to NYC.