2D,
Lots of private pilots, in my experience, rely almost absolutely on GPS to navigate en-route, and many rely upon it for approaches.
My points are:
First, IO540's comments were a little misleading, regarding use of ADF on large aircraft.
Second, many people seem to think that GPS, with or without RAIM, is almost infallible. That's certainly not the case, and we should be aware of that fact.
If we are moving towards a world in which there is only one navigation aid, GPS, (and it's an apparently attractive world, too, from many points of view), then we need to understand that we are placing all our eggs in one extremely fragile basket. Using the same aid for en-route and approach guidance is nothing new, but to only have one aid available (or indeed, to become complacent and lose skills appropriate to interpreting the other ones) is altering the risk mix significantly.
Noting your location, perhaps we could chat this over in Mitchell one lunchtime this week, if you wish?