So, is it a 'time of year' (season) thing too?
Just got back from our very first cruise (not just
DCL, but first ever) - a 7-night Western (12/12 - 12/19), and I assure you: we FELT it! lol
Sometimes it was nice, like being rocked to sleep each night. Others, less so, like stumbling side to side across wide hallways (not cabin halls, but through lounges, etc). On our last night, I actually caught a rolling cart in the liquor store (pardon the redneck reference, I forget the name!) just before it smashed into a wall of bottles!
We had good weather for 6 of the 7 nights, as apparently the captain steered us around a front. However, our last night was ROUGH (apparently there had been hurricane force gusts just before we left
Castaway Cay). Perhaps because of the rougher end to the trip (?), I definitely experienced a TOUGH adjustment once back on land. I hadn't noticed it in any of our ports, but after a day at home it was almost severe enough to warrant a trip to the Dr. Thankfully (blessedly!) it passed w/in 4 days or so.
You'll note though - it wasn't enough to keep us from rebooking another before we got off the ship!

(here's hoping February is smoother than December was!)