After having to back our 14 year old camera less car out of a long dark driveway in the rain, I really wanted a back up camera. Maybe not so much if reverse lights were actually bright enough to be useful, but they generally aren't.
I drove a rental VW with lane keep assist, and it was awful, occasionally wrenching the steering wheel in odd directions for no discernible reason. I didn't know what it was or how to turn it off.
We now own a Kia Niro EV, and the LKA is much better (plus you have to turn it on, vs it being always on). A nudge here and there, nothing major. The blind spot warning is also a very good feature, although it beeps when there are two turn lanes and you're in the far one!
Adaptive cruise control, which keeps your distance from leading cars, would probably help with fatigue on longer drives (which I've yet to do).