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Your truck example makes perfect sense for a heavy truck. I'm not sure that is DWL tho, since the driver probably has is foot on the floor. On a bike, if you can go fast coasting, of course you go as fast as sanely possible on the downhill. It's actually more efficient to increase power on the climb since the 'extra' energy output is not wasted as much as it is on the flats where the the extra energy would have more loss due to the v^2 aero losses.
I think DWL is applicable to a powertrain/hill combo where you need to do this to keep it in high gear, and many modern automatics require a very light foot to keep it from shifting down.
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