I bought a "GPS navigator" for use in Europe. Generally it was fine, no arguments with the human female "navigator", getting us to hotels in strange places. However, I believe that an overall map of the country visited is essential once you get out of the main centres. In one instance travelling down the Rhine valley the GPS insisted that we take the ferry across the river and drive down the other side. I presume to avoid roadworks that were no longer there. Fortunately I knew we were on the right road.
Also if you are touring it is easier to put in waypoints using a map. To find places in towns, especially in strange cities whilst driving on the "wrong" side of the road is where a GPS really comes into its own, especially with road signs in foreign languages.
So yes I will still use maps, and won't blindly accept that I can drive down a road no wider than the car to get to a destination.