Just adding to this, as I've thought this for years!
Manual drivers also are much more well aware of their speeds, they understand, road speed, transmission speed and motor/flywheel speed or RPM. Today's auto drivers more so don't even care, there's no ambition to learn, they just want to get from A to B.
On the other topic, Both my car and my truck have throttle by wire, but they are tuned VASTLY different from each other. The car still has all the fail safes, etc, and can 'fuel' cut more safely at the rev limiter, and 'boost' cut safely if over boosted, but its incredibly responsive (sports car) you put your foot down, and it opens the throttle body. My truck however, I could floor it on the high way and not always get WOT in return. Sadly in the truck the programmers thought it better to not provide responsiveness but instead rate fuel economy and emissions over my inputs. I just don't understand why I would need fuel economy when I'm attempting to go WOT, I fully understand what that means in terms of fuel consumption. Then again, I'm a driver, and not a sheep.