In our OPT iPad, the reversers make a significant difference to landing distances in two engine operative as well as single engine landings, and wet runways as well. It either makes that real difference or they’re telling big porkies! Our SOPs state, do not stow reversers until stopping is assured. I can feel the difference. An aside, I can feel the difference in stowing the speed brakes as well.
but I do not check them taxiing out.
A few few times I’ve left them out a bit longer than normal, and a few times had the reverser light on the overhead illuminate, so I put them away in good time when decreasing below 80 knots +/-