I must admit that my last 3 cars have had active CC and I never use it. Perhaps because I rarely go far enough.
i did try it once on a long run and found it LESS economic than non use. The reason is that the car will keep at the requested speed come hell or high water, uphill and down dale. Whereas YOU driving can chose how you approach hills both up and down and let the car go into overrun downhill, saving petrol which the CC won't allow.
As far as active safety features are concerned, emergency braking both at low and high speed are a must have. It saved me hitting a pedestrian on a dark afternoon, she under trees wearing black walking on the verge of a dark country lane with no footpath.
Lane keep assist is frankly a pain in the @rse and I turn mine off. Blind spot monitoring 10/10!.
Each unto their own.
