I have always been interested in GPS, but so far never have used it on a ride. Your biggest issue if you want to know where to go before you get there is intelligence, not keeping on your route. In reasonably developed areas if you have a map it is probably correct and easy to follow. If you get turned around, then GPS will sort you out right quick. But as with the below one's keel thing, the GPS is like online news that is destroying news gathering institutions without adding it's own infrastructure, though it did find some erors on maps, I guess.

When cycling two side of a river can be utterly different, whle hard to get lost on either one. I can't say I could be bothered, but running the route in streetview would be more relevant. That way you can tell what the road does, not just whether you are on it. And that is the kind of stuff that is integrated these days.