Dear John
I'm very happy that you clearly have a photographic memory and that you're obviously not navigating your way into anywhere strange that you haven't got an up-to-date map for. Good for you. You seem to be making the assumption that it's possible to forget how to read maps, and that those of us with SatNavs don't have maps in our cars. You also have a touching faith that your collection of A-Zs are fully updated (and will update themselves?).
After getting very lost, very often when navigating myself around when driving solo and at night using maps and Google directions over the past few years I decided it was a very sensible use of technology to have a SatNav in my car. It saves my temper, it saves fuel and it saves other road users from encountering me in a furious mood. It enables me to change lane in good time when in complicated one way systems and it enables me to arrive in good time, or calculate an alternative route quickly if there's a major snarl up with the traffic. While I'm sitting in the traffic. Which is far safer than attempting to do it myself. Oh, and the SatNav has street names on it, so I don't need to trust to my increasingly middle-aged memory. Memories can go wrong, too.
Sometimes technology is just clever clogs unnecessary - this particular gizmo has been a valuable addition to my life, and you can sneer at it all you like. I love maps and have lots of them. I don't see the two things as being in opposition to each other. I'm also not a slave to the machine and will happily take an alternative if the route suggested by the GPS seems a bit daft.

No need to be a Luddite. You've made your choices, we're making ours. No need to preach, either.

Anne