Our son, one of the charmers we raised, managed to get his family upgraded to a suite once on a cruise they took. It came with a butler and plenty of space for the four of them. The butler would bring food for the kids' early dinner and then our son and his wife would get to go to dinner on their own later after dropping the kids off at the supervised children's area. They were pampered and made to feel really special and I'm concerned that it spoiled them for any future cruises.
We've been upgraded to what are considered suites a few times but they were nothing like the premium suites available on a lot of ships. The premium suites come with the standard butler service but then you can expect all sorts of other amenities depending upon the cruise line and the ship.
Premium suites usually range in size from about 1,000 to 2,000 square feet compared to a standard cruise stateroom that averages 250 square feet. They often include a grand piano, a whirlpool tub often on the balcony as well as in the bathroom, a small refrigerator and microwave, a dining room table, premium linens,--the list goes on.
Often there are special perks that come with booking a premium suite as well. Sometimes there are designated areas on the ship for suite guests only and special restaurants as well.
On one back-to-back cruise we took, our room was sandwiched between two suites. They must have had a space that needed filling and our stateroom fit there. On one side of us was the top premium suite and when we were in port for the turn around day, our cabin stewardess said we could take a peak. The room wasn't made up yet but it was still amazing. Gold fixtures, a little kitchen and butler's pantry, and of course, the hot tub on the balcony.
Sure we could always book a premium suite for a cruise but that would be it--a cruise. I just couldn't justify giving up several cruises just to be able to enjoy the luxury. Still, maybe someday for a special occasion. Even a practical girl can dream.