I’m a bit of an outlier here as all of my x/c flying, which is akin to about 80-90% of the flying I do, is IFR. For IFR, IMO, GPS is a game changer for both Enroute and Approaches. That said I do have VOR/LOC/GS capability in my plane and occasionally practice using it as well as keep up with the VOR log. I also won’t launch IFR without at least one functional Nav radio if there’s a NOTAM’d GPS outage, or potential outage, along the route. That’s happened to me on more than one occasion although I have never lost the GPS.