We took a spring break trip to Arizona a couple of years ago. The I-80 stretch through Nebraska was the only stretch we allowed the kids to watch a movie. They didn't complain or even really miss it the rest of the trip, but that stretch through Nebraska just seemed cruel to put them through.
Oh man that stretch is long and boring. Though I did find it interesting to think about when Native Americans were there and it started to get homesteaded. So vast. The small hills to the north at some point as you get further west were pretty. Probably just excited for something not flat as hell.