In the old days we had paper maps and I checked routes before I left: not doing that anymore has cost me time rather than saved me time. Many a time Google maps has sent me to the wrong place. Once to the middle of a mustard field in France which was a destination it changed to mid-route to a house called La Mutardier. 5 hours wrong lost there.
Less than useless on a motorbike due to its UI, actually quite dangerous.
I would say it has cost me many hours and saved me from carrying a map.
Evermore useless adverts, and now hiding places that it doesn't get a kick back from.
Oh and it's cost me money in fines from taking me the wrong way down streets I was not allowed to drive on. With no way to feed that info back into the system. When its wrong it stays wrong for years sometimes where I live, and we have street map, it ought to be half decent and at least safe for drivers.