You don't know what you have missed until you have tried it.
Have done two sea cruises, and one river. All fantastic.
The sea cruises were on small ships so nothing Disney like about them. Very grown up, in fact on children allowed.
Cruises allow you to get a taste of a country so you can go back and explore if you want.
No packing and unpacking.
I too get seasick, but still worth it.
Life is to short not to try new things. If you try a cruise and don't like it you don't have to do it again.
Grab life by the b..ls and live a little