I always found landing off a boat and navigating my way out of a new town or city to be stressful. I can remember first using my old Garmin 2610 and landing in St Malo and going wrong and hearing those immortal words "Off route recalculating" and being content that I wasn't going to have to watch the road, the map in my tank bag and do mental gymnastics as to what direction I was going based on the orientation of my map and the direction the road was taking me, and in the worst case, having to stop and get of the bike to get my bearings or, god forbid, ask a native for directions in pigeon French. I was reasonably competent at that sort of thing and even acted as navigator for a chum for a couple of years doing night time (Timed) navigation rallies (if you ever want to find out if you are prone to motion sickness that's the activity for it

) )
The Garmin came into its own even more when driving from Belfast to France on at least 6 occasions with three kids in the car and on a couple of visits to the states with hire cars. In those circumstances you do not need additional stress.
I too use maps for planning and know where I'm going but like the ease that a gps affords.
Oddly when going hill walking I've always taken a map and an ancient Silva compass just to check direction if the mist comes down. Recently however (while still carrying a map and compass), I've started using("dicking about with", according to my wife) my phone when walking using OSMand maps