A well known ferry company has stopped using a turbine powered craft between Harwich and Hoek van Holland. It had twice the speed of a conventional ferry, but seven times the fuel burn.
Yes, but it is an issue with waterships. Waterships (and airships) float, so they spend absolutely no fuel when stationary. The drag of a watership increases with the square of its speed - more than that when the speed is around wave speed barrier - which means that a ship which is slow can cover the same distance in longer time with much less fuel burn.
And conversely, a ferry which had high speed thanks to powerful diesel engines would also burn much more fuel than a slow ferry with a diesel engine.