GPS information is all well and good, but it should be a fallback, I believe, to the most-reliable methods that have been proven to produce the most successful results over a good period of time.
Plus, try to imagine attempting to travel without GPS info if something like an EMP burst (like countries such as China, Iran, the so-called “Palestinian State”, and the NORKs have promised, to name just a few) occurred and we were forced to use anything other than dead electronics to find our way about...
It's an interesting point. For me GPS is just too good to not use it as a primary. However, it may be impossible to maintain proper proficiency with older practices of navigation if I do so, which leaves me vulnerable.