Yeah, the sailing, while fun at first, became a mind-numbing exercise in watching not very much happen.
The first time you get to sail, it's all "FUUUUUCK YEEEEEAHH!" as you're jumping over waves and watching things fly by, and the music kicks in just at the right time and you're all "THIS IS THE GREATEST THING EVER!"
But after that feeling wears off (and it does), you're left with a rather time-consuming method of travel, and a world that is a bit too big for it's own good. In many ways, it's perhaps the biggest "land" you get to explore, as you can look for miles in every direction and still see something on the horizon. But it just becomes so tedious to use.