Not crazy at all. We did all three on the 10 day Holiday Cruise.
At high tea you will be brought a small menu that outlines all of the teas available. You server will then bring you that tea in its own pot, a cup, saucer and strainer (this is loose tea not tea bags). Other servers will stop by with many wonderful things for your to try like scones and cream, eclairs, little finger sandwhiches, etc. It is a very nice relaxing experience.