Gotta disagree with you there Jon....I reckon a GPS is pretty essential for a lot of people.
I use them for work which may be slightly different, but it still applies to anyone else riding in places like Morocco....sure you can do it wihout one, but you would find it extremely hard to find some of the best tracks and places to go.
For day to day use, a good example of their use for me was last week, on the way back from the Czech republic, heading for the Hook Of Holand port to get a ferry with 45 mins to spare from Antwerp.
The signage there is crap and I'd never used that port....there are literally hundreds of docks, confusing directions (at least five different places signed as 'Hoek Van Holland' and no normal ferry signs until you get to within two miles of the actual passenger ferry area.)
I'd made the booking the day before by phone and knew nothing about where the actual ferry went from.
Luckily, I'd looked at the GPS and set it to take us to the end of the black line marked 'Harwich ferry' and the GPS took us right to the book in kiosks.......even though the area looked a lot less 'ferry port' like than the stuff we'd been riding through for the last half hour.
Couldn't have done it with a map in that time either.
Sorry, thread hijack but I'd rate my GPSs as one of the most useful and essential items I've got on my bike, for the sort of thing I use mine for