On hills I can beat my cruise control for fuel efficiency but no way on the flat.
When using cruise I still rest my foot on the accelerator, I just no longer need to apply pressure.
The off button is right beside my thumb, or a quick tap on the brake pedal, not complicated if you see that car on the side of the road, a blind corner or anything else you would slow down for.
Most of all cruise control helps prevent fatigue. Most of my drives are long, 4-6 hours of driving at a time. Cruise control keeps me relaxed as I am not constantly checking and adjusting my speed.
Of course I don't use cruise control in inclement weather, poor road conditions, gravel, or in the winter. Your version would be good for those situations.
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