There is a difference between driving for pleasure and for a reason.
A lot of the driving I am doing is to get to a customer's office. To be honest, all I need to do is to get there, see the customer and then go to my next appointment.
Yesterday, I went to a friends house for dinner. I could have spent 20 minutes checking my map, looking for alternative routes in case there were accidents and seeing if there was anywhere interesting on the way.
They live around 50 mins away. we left at 5.30 as soon as I finished work, and followed the Sat Nav to the address. We drove back at around 11pm, and all I needed to do was concentrate on driving, not having to look for road signs etc.
If I was retired or constantly had a passenger, then I may not use it, but to be honest it is so easy, that I don't see a problem with it.
Of course, with a lot of Sat Navs, you can also put in "Points of Interest" and other such items, so you can see other places.
Yes there will be idiots who don't know how to use them properly and go miles out of their way, but that is down more to their idiocy than a reliance on technology.