Most times, I think my GPS (and Google Maps on my iPhone) are a lifesaver.
I don't use them all the time, but when I'm in a bind or going to a place I've never been before, they are awesome.
Everyday I take Route 34 to the Parkway (and vice versa) as part of my commute, which means I get to navigate a traffic circle (where Rt 33 and 34 meet with Rt 547).
It's also everyday that I encounter a near accident due to any number of drivers not knowing how to navigate said circle.
Here's a friendly PSA to help out.