Motion sickness comes from the conflict between your eyes and the part of your ear which tells you which way is up and lets you stay in balance. It is way less of a problem in big vehicles where you have a lot of things and people to look at, which experience the same forces as you and so move the way your brain expects. Being in control of these forces is another way of aligning what you perceive and what your brain expects. Motion sickness is very real, don't discount it as a non issue.