I drove a car with adaptive cruise and it was cool. Still as stressful as some cities subway lines (learning curve for me and most places kind of assume you know). The monorail and Tesla loop in Vegas were both much less stressful but the loop was kind of worthless (just as much walking to it as there was to just walk to the entrance of the convention center). Autopilot on planes seems pretty decent now too, but the cost of flights and layovers still stress me out. They are really only worth to get to a destination for a while and in a rush.

That said the self driving of a subway would be the way I would go if I had to choose a day to day option. As long as it's consistent and at most one change over it's not that bad to navigate.