I spent four hours in New York yesterday:

Wandering around Terminal 4 trying to figure out where my next flight left from and how to get there since there isn't a single posted sign anywhere as to what airline leaves from what terminal: 15 minutes.
Standing outside waiting for inter-terminal shuttle: 10 minutes.
Riding shuttle from Terminal 4 to Terminal 1, thinking at each stop that Terminal 1 must be next, and being wrong four times: 20 minutes
Queueing to check in and progressing maybe a third of the way to the front before having the good fortune of being pulled out by an agent: 30 minutes.
Queueing for security: 60 minutes.
Queueing to get on plane: 15 minutes.
Sitting on plane while they load luggage and 150 missing pairs of headphones: 60 minutes.
Sitting on plane while they de-ice the wings: 30 minutes.

Traveling through JFK on a future journey: not at any price.