Hi penlanspice,
I take it you are doing a package with Virgin with car hire included? If so, Virgin has its own Dollar desk (i.e. you don't use the regular Dollar desk). I wouldn't bother with speaking to a rep unless you need to ask directions, etc., although there will be plenty of them around if you do want to speak to one.
If getting out of the airport as quickly as possible is your aim, then here are a few tips which have worked for us.
Make sure you have correctly completed your customs form (white, one per family) and visa waiver forms (green, one per person). If you have made a mistake you will be sent off to complete another and will have to join the back of the queue. They will be handed out on the plane and instructions are in the in-flight magazine - if you make a mistake, ask for another.
When you come down into the immigration hall from the plane, you will see a bank of desks. You have to queue behind the line - DON'T step over it or you will have your wrists well and truly slapped! There will be officials directing you to try to regulate the flow. Look over to the far right of the hall. There is a lane for US citizens. Quite often the one or two lanes next to it are empty because people seem to congregate in the middle lanes. I think when people see lanes with queues and lanes without, they assume those without aren't operational and just join the queue.
Once you have passed through immigration you need to collect your bags. We have suitcases with built in trolleys and a system where they can be strapped together so we don't need to bother with trolleys, but if you do there are plenty about, but I think you will need a dollar or two for them.
You then need to pass through customs and security. This is usually a quick procedure, but since September 11th there are queues. I think it took us about 10 minutes in December.
Next you will need to put your baggage on a conveyor whilst you get the monorail over to the main terminal building. If you can, walk right to the far end of the waiting area to board the monorail, you will then be first off at the other end.
You arrive at the main terminal on level 3. Despatch most of your party to baggage reclaim on level 2 whilst the driver(s) head for level 1 for the car. The main bank of car hire desks is along the back wall. You need the Virgin Dollar desks which are opposite them - you can't really miss them. We don't normally do packages so we use the main Dollar desk, but I think I'm right in saying that you have to check-in at the Virgin desk first which is an island just in front of the dedicated Virgin/Dollar car hire desks. Arrange to meet the rest of your party here as the garage is just out of the door next to the car hire desks.
That's it! We usually get lucky and are usually on our way within about 1/2 an hour of touch-down. It does depend on how many people are in your party and how keen they are on the blitz-it plan!
One thing you shouldn't try to hurry if you've never done it before, is getting used to your car. You probably know that the cars are all automatic and some of them have foot brakes rather than hand brakes. There can be a number of other quirky things, but the Dollar reps will help if you need it.