the editor completely misunderstands the point (or misuses his/her GPS). The potential clutter of the user interface/map/traffic aside, GPS is the most dramatic simplification in driving to emerge in years -- provided you just listen to the voice prompts.
When used correctly, this one amazing device outsources your mental burden of navigation, and presents it to you with a clear voice that lets you devote your effort to (hopefully) driving better, although obviously this has turned many people's attention elsewhere.
If you've ever found yourself in an unfamiliar city in fast moving, dense traffic, trying to find an address, you will be grateful that you can offload your navigational workload to the GPS, which tells you clearly and plainly when to get ready to turn, in how far a distance, potentially even making it safer as you no longer swerve across 3 lanes of traffic at the last minute while looking at a paper map.
Of course, people who use it to navigate down isolated country roads they're familiar with will never see the point, but for someone who's task-overloaded in a busy situation, listening to the GPS voice is an amazing improvement in life.