I own modern Kia with these systems you described. I use this almost constantly BUT: the first month after getting the car I was terrified, literally scared and 15 minutes drive exhausted me just like 2 hours in my previous car. I was learning to trust the system, had to known all the limitations first. I now know when to take over and really like adaptive cruise control especially in traffic.

I am a software engineer though, there is nothing "smart" in my home (apart from TV obviously) and I can see how people can fall into the trap you described.