As do I, but basically never on a cruise. Put me on a ferry or some sort of sightseeing/whale watching cruise however and I'm chumming the water (or the porcelain water) in 20 minutes.
There's meds for that anyways, you can get them free on most ships, or just ask your doctor for a script for Ondansetron beforehand - that **** is magic.
Cruises are a lot different than what most people envision if they've never done one before. I'm the "don't sit still well" type person as well and I stay busy all day whilst my wife sits and reads a book, people watches, and sips drinks all day, hardly moving except to go to the bathroom. Meanwhile I'm constantly on the move just doing whatever I come across - endless stuff to see and do. Sometimes I stop and just kinda sit and watch the ocean go by, but it's pretty seldom.
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When we're in a port, we usually explore the heck out of it, sometimes we'll do 5-10km on foot just exploring. Then back to the ship for the buffet lol.