It amazes me that people think just because the device has "fortified glass" and not "Gorilla Glass" means that the screen sucks or that it scratches more easily than GG.
There are lots of different fortified glass brands out there, Corning's GG being just one of them. They all work in the same way, but since Corning is the only one to really push their brand, people auto-assume it's the best and/or only one. There are tons of different fortified glass brands out there, just because the device doesn't advertise "Gorilla Glass by Corning" doesn't mean it's not as good, or even better, than that product. Hell, some devices actually do use Corning Gorilla Glass, but due to the OEMs not wanting to pay Corning for advertising costs, they don't actually advertise it as being from Corning. In the case of the Galaxy Nexus, we just don't know.
The bottom line is, whether it's unbranded fortified glass or "Gorilla Glass", it will still scratch. Sure, pens, pencils, coins, keys, and other things that would likely be in Joe Everyday's pocket won't scratch the glass. But dirt, especially sand, will very easily scratch it. Even just one grain of sand can create light scratches if it gets rubbed into the glass in the right way. People don't realize that everything has a "grit" level, and dirt/sand has a higher level than your keys.
What's the easiest way to make sure your device stays scratch-free? Get a screen protector. If you get the right one, you won't even notice its there. Make sure it's the "clear" or "crystal" ones. You can even get the really cheap ones from Amazon, you would likely just need to replace it a little more often than the 15-20 dollar "high end" ones.
"Scratch resistant" doesn't automatically mean "scratch proof". I'll never understand why people refuse to use a 3 dollar item to protect their 700 dollar investment, "just because" they shouldn't have to, and then get mad when their device shows wear/scratches. Makes no sense to me.