Interesting! It has worked for me since they started that service (caveat: I travel J more often than F).
The advantages are a) the golf cart to transit security if you land a long walk away and b) being taken through transfer security quickly even though there is no priority lane any more.
I once was offered a ride although I was in J: father with three well behaved kids in J, mother was in F, so got the golf cart treatment. The family got loaded onto the cart and suggested to the escort and the driver that I (sort of elderly) should hop on as well.