I have used JFK but as tourist, and at that time the waiting was 30-45 min, than 5 min fingerprints, few questions, stamp on passport and one form (I do not remember what form was this but was like how long we could stay in USA) and then we went to take our luggage.
So I wonder if you are with DV visa do you wait in same line with tourists or in some other faster line. And how long is the procedure for activation of GC do we have to go in some other separate office etc, etc.