There's no poll option that reflects my experience - so I'll reply long form.
We were a party of 5. Two of us experience some motion sickness in cars (backseat, or reading - mild unease, nothing major like vomiting) and we both have been FULLY SERIOUSLY miserable on cruises, to the point where we'd never risk one again. Two of us have no issues. One is older (69, history of epilepsy and heart attack - seriously stubborn and insisted on trying out the ride despite the rest of our opinions).
1. Cruise/car sickies had no issues.
2. One of the two Normies felt a little disoriented, but no upchuck, and got over it quickly.
3. Senior was in pretty rough shape, but no upchuck, and 30 mins in A/C with a soda fixed him up for the rest of the day.