Less pleasant than GPS, sure, but by no means a rare skill or impossible to achieve. Would you get the road wrong more often, and have to stop and re-check? Yeah, definitely. Would you still get from A to B in roughly the same time? Yeah, definitely.

For what it's worth, my experience is the opposite. When I read the map and know the whole path ahead of time I'm far more likely to get it right the first time compared to using an app in the city that tells me to turn right 200 feet from the intersection when I really needed that information 200 yards from the intersection. Or sends me on some weird right then left then right thing instead of realizing I can just go straight.