>I honestly don't understand how people get value out of most of these. That is, I'd rather just use a system where I know I have to be in control at all times,

>I honestly don't understand how people get value out of most of these. That is, I'd rather just use a system where I know I have to be in control at all times, vs one where "You only have to be in control 1% of the time, oh and if you miss that 1%, you're dead." A lot of accidents happen from a split second of lack of attention. Lane keep prevents you from inadvertently drifting over the centre line into traffic. Radar cruise control prevents you from rear ending the vehicle in front of you. Both of these simple features are awesome.