I’d agree that most of the time I don’t see other drivers downloading in the pits. But that isn’t true at important races. I hide in the back of my truck (so I can see my laptop screen) and review what just happened and where I can find time while the laps are fresh in my mind.
I find that going home and reviewing is very helpful, but not as helpful as seeing it RIGHT after it happened. Mainly I’m looking at my lines and splits with the GPS mapping.
In a team setting I do the same as Matt. Compare to teammates. Especially helpful when the whole team is stuck at the same lap time and you can overlay and find each other’s strengths and weaknesses and everyone improves.