I've found that CC allow me to be more focused on the road, rather than looking at my speed every so often. My CC controls are on the wheel, so I can adjust it just by moving my finger, and I always keep a foot on the (accelerator) pedel ready to react as if I was maintaining speed with my foot. I know plenty of people that "rest" their foot while using CC, and that is just asking for an accident since the reaction time is longer.
