I find it funny how I was approached several times, by people with a smartphone in one hand asking me for directions. Most of the time I don't know answer either, because I suck with street names and my German is still spotty. But I can help those people by orienting myself with a map on my own phone.
I like to use my phone to navigation. Especially public transport in Berlin, however as I start to learn routes I don't need it as much as two years ago.
Recently my wife tried to get to a place on Streetname 65A, but Google Maps showed her only Streetname 65 (without A) and it was a wrong place. I found it on OpenStreetMap - it was a building on the other side of the street. That was a lesson for me and installed Maps from F-Droid (an ad-less fork of mobile Maps.Me). It is an amazingly detailed map and offline one as well.
So even with smartphone one has to be always prepared to ask around or plan in advance, so maybe after all it's not as good as we like to think.