The Garmin units have tens of thousands of businesses on their maps, including gas stations, hospitals, etc...
Hell, my Garmin will alert you when your gas gets to 30% full and then automatically start plotting alternate routes for you to the nearest stations.
A GPS is just a much, much better map.
If you use a paper map, there is NO reason not to upgrade if you can afford it.
If you get lost, a map does you no good if you can't pinpoint your position. In fact if you get your position wrong, the map can lead you in the WRONG direction and worsen your current situation.
With a GPS, you *always* know where you are on the map.
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