The OP is from Europe so there was probably some novelty to the 20 hours of endless corn the first time. But, yeah, once is enough. Having driven cross country several times for various reasons, the only appeal of the run from Chicago to Denver at this point is that you can do 100mph without much worry and get through it that much quicker.

I will say both Des Moines and Omaha are surprisingly nice to visit even as an awful "coastal elitist". Had some wonderful experiences in both.