Bikepackers have been using on-bike GPS navigation for years. These newer devices just make it a bit easier to create routes by linking directly to your smartphone. The eTrex series of GPS from Garmin are more popular for long, multi-day rides because they run off AA batteries.
This is an ad. Bike computers are just really expensive single purpose smartphones.
Minor nitpick: GPS doesn't enable adventure. If anything, having constant GPS guidance takes away from the adventure. Many of my best memories while biking have happened because I got a bit lost and stumbled upon something neat in a place I wasn't expecting to go. Same goes for road trips.
But that's just me being a Luddite. For now I think I'll stick to my phone's GPS if I need a map.
I normally use ridewithGPS and a cheap head unit for brevets -- but i carry cue sheets, too.
so this journalist used a gps and it was great experience? great story!!