When we arrived, we had done online check-in so there was a person stationed out front that gave us everything we needed. We had a unique situation and had to go to the desk anyway, but most people would not need to if completing online check-in. So, we just pulled the car over and didn't need to park it.
That said, I seem to remember not needing the key to enter the parking garage. You insert the key as you exit, I believe. If you are staying on a points reservation, you will not be charged for parking.