Good description!

I would add that one can walk outside the wall of glass on the bottom floor anywhere, as there are taxi desks all along that side of the building, around 50 yards apart. My habit is to go right once I hit the arrivals hall, go down the first sloped conveyor belt to the bottom floor, then out the door that's right in front of me - there's a taxi desk there.

Sometimes there's a long line for taxis, but it moves quickly.