Arriving was a nightmare - 6 international flights came in at the same time and literally 7 TSA staff processing everyone. Going out was better but still painfully slow.
We used the Virgin facility at DS earlier this month and also used their transport to get to the airport. We were picked up at 4:15 and got to the airport around 5:00 (had two more pick-ups after us) so were there just under 3 hours before the flight (7:50). Security queue was much longer than Gatwick but we were still through it in plenty of time. So I would allow yourself a good 3 hours after dropping off your car - assume you will have a hire car for the trip.
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