I left Kansas City a few years ago, but I lived and rode there for several years. Before that I lived and rode in New York City. My NYC riding was all day every day, so I was used to heavy traffic and some bad attitudes, but I have to say KC seemed more hostile. I don't think I was in more real danger, but I tended to feel like a fish out of water. There wasn't much of a cycle-commuter presence. The environment was even more car-centric than other places I've lived (other cities and towns in addition to New York). Those are purely subjective emotional reactions, and the physical reality of commuting in KC something that you'll adjust to easily enough if you're used to urban riding. Overall, it's entirely doable, and a map and some exploratory riding will teach you all you need to know.