Barely played the game without, I think it DOES give nice effects, but it doesn't make the game more ugly, it only gives more effect to it. For all you know you could play as a Telekinetic person that can swim her way through air. =p
I just think it give the more watery feeling. Even though it CAN be very annoying at time.
The only thing, like inkblob said, is that it's still used ABOVE the water, which is weird.