Easter throughout the ages has always been a special time and in New York in the early 20th Century was no different. A classic photo of the day, traffic, shops and lots of people! Nothing changed there then.
I would hazard a guess it would be quicker to walk on 5th ave then to catch a bus or use your own car. We can see the new shops along the street, blended in with the older church. Fashion at the time seemed rather formal to me, hat, suit etc.
This photo was taken from http://theboweryboys.blogspot.co.uk/ which is a New York themed history blog, one I really enjoyed looking at.