Yes, GPS is a safety feature and rather nice, but it WILL lull you into wrong safety attitude
It's surprised me just how quickly you become dependant on GPS in a GA environment.
I still back up with a chart, but the idea of switching off the GPS enroute would be a bit of a shock I'm sure. I'll try it next time I'm flying (well maybe just turn the iPad over) and see if I can navigate the old way?!