I've never felt the need for CC on a bike, though I suppose it would reduce right hand/wrist fatigue somewhat. If you're using CC watch out for trucks - 80 is one of the most heavily used truck routes in the nation. Easy to come over a hill at 85 and find a slow truck in the left lane trying to pass a slower truck in the right lane.
It's the monotony that's the worst. The monotony and the wind, always the wind.