Why? I hate driving and would rather be reading or goofing off on twitter than being angry behind the wheel as I get somewhere.
Not for everyone but I'll never go back to driving.
If I want to engage my brain at all I'll listen to a podcast or something, but often those half hour periods of relative disengagement are very nice breaks to have.
That said, I do choose 10 minutes of walking over 2 minutes of driving in anything but a torrential downpour, or 2 minutes of walking over an extra 30 seconds hunting a closer parking spot. Maybe it just all comes down to not wanting to deal with (potentially unpleasant) people.
Adaptive cruise control for fast but varying speeds is great, however - it makes the spacing much better, which makes things more relaxing. It also reduces the active brain load to 'what lane do I need, what's coming up in the next mile, and do I need to be preparing to stop/exit', rather than needing to worry about the car in front of you so much. For me at least, it also makes things like lane changes more deliberate, so instead of "need to change and keep speed" it's something more like "I'll get there when it's safe, and change lanes if it's really clear", which is a much better mindset.
My previous experience with adaptive cruise control with another manufacturer wasn't nearly as polished, so I didn't think much of it when I bought the car. But it quickly became one of my favorite features!