I'm just glad we can put them in folders, I hated not being able to hide Newstand in a folder.
I Wondered if Apple would ever have a toggle in the the settings menu to hide the built in apps. A bit of a compromise, they still come built in by default but the user can ultimately hide those apps, without being able to completely remove them.
I have a last page on all of my iOS devices that hold the apps that I don't often use but don't want to delete. I also use it for the Apple apps that I don't use in addition to apps that I download because they look like something I would use, but don't have time to explore yet etc...
Not a good as completely hiding the app but it is out of the way, and still there for you in the event you want to explore it later.