I didn't particulary care for it myself either. In Wind Waker the sailing could be reptitive, but on the flip side it could be a fun experience when you're exploring a giant ocean and can jump off you boat anyime to try and swim to an island or a whatnot. In Phantom Hourglass you just point to where you go and that's it. But you can't just wait to get there because plenty of annoying enemies and obstacles along the way to force you pay attention.
The Ocean King temple is a massive Buzz Kill like everyone else already said.