Lane assist combined with adaptive cruise control pretty much means my Accord is driving itself to me, as its driver. I've only had problems with the lane assist when the sun is shining really bright on the road when it's low in the sky (sunset and sunrise). I think it doesn't "see" as well at those times of day.
Yes, I have to keep my hands on the wheel and pay attention - but every driver should anyway. There are so many crazy variables out there.