It’s both, really. The wakes can be a significant problem in marinas, especially from bigger boats. Think of all those smaller sailboats and ski boats bobbing around at the dock when a large cruiser comes around throwing up a 5ft tall wake. Or even the people walking on the floating docks when a large wake comes across. Some of the gas stations are also floating on a dock.

Speed is also an issue in smaller marinas, but less so in large ports where a ferry like this probably operates.