Google has slowly changed how it displays driving directions to limit routes to ones it thinks burn less fuel. When plugging in the drive to get to my parents it presents one option that uses a ferry. The directions treat the ferry like a bridge that you could use at any time, and it no longer presents alternate routes that use actual roads.
The ferry runs twice a day.

@Apiary There's an "avoid ferries" option in navigation settings. Waze has it too, as do probably all other navigation apps out there worth their salt.

Actually, there's a chance (albeit a tiny one) that Waze actually would know about ferries' time tables, because it's so much more driving focused than gmaps.

@neatnit i also know how to drive home. But people who don’t know the way may think the ferry is the only option.