Again, I will humbly disagree.
Have you ever driven on a racetrack or autocross? Do you honestly think you have the same attention to details and surroundings when bumbling down your side road to your house as you do when driving spirited?
If you don't have enough discipline as a driver to give your FULL attention to driving, if it's so terribly boring that you can't bother to make the effort, then you shouldn't be driving.
Not only do I have the same attention to details, I have MORE attention to details because more visual data can be taken in at a lower rate of speed. What you are describing is not a heightened sense of awareness, rather it is that the information is exceeding your ability to take it all in so your mind is in overdrive but can't keep up. Plus, public roads are not a race track, there are other non-professional drivers, pedestrians, animals, etc.
There is no debating this, nor the data that speed kills. If you were correct then raising the speed limit would heighten everyone's attention and supposedly fewer accidents? Sorry but motor vehicle accident data contradicts this, and has for longer than there have been cell phones as a distraction.