For several years I have worked as a freelance sports writer for local newspapers, and as such I get to drive to high schools out in the middle of nowhere. A few years back we were living in Orlando and three hurricanes hit Central Florida, and in the process the wind knocked out tons of street signs, knocked down some exit signs, and generally made driving very difficult for several months. Several times I got lost in close-by urban areas, simply because the street signs were gone. An extreme example, yes, but I would have killed for an affordable GPS system.
So you've never once missed a turnoff...?
And I guess you haven't been to WNY in a long time where the street signs are so faded you really can't see half of them.
Nowadays I cover some high school sports in Northeast Ohio, and as the shortest-tenured freelancer I usually get to the games way out in the middle of nowhere. There's no way in hell I am trying to navigate rush-hour traffic and trying to follow road maps and street signs, especially not in the winter. Plus they can help find alternate routes in seconds, find close-by businesses, etc. For me GPS units are worth their weight in gold, and are worth every penny.
EDIT: I know that sounds funny, considering I was complaining about the cost of map upgrades, but my complaint isn't the cost, but rather the apparent razor-blade model the companies are using on their lower-end units. Why pay $70 for a map upgrade on a $100 unit when you can spend another $50 and get a much newer GPS with more features and the upgraded maps?