You could argue that they should have provided the "hide" option for the app library as well, but Apple obviously has a reason not to. I'm guessing one reason is that if they did give that option, people would hide it without actually trying it.
I think I covered it in my post above as far as options that folks have, but I don't work for Apple and I also don't think folks can really properly evaluate the benefit of the app library until 3rd party widgets are available. I for one am loving the app library, but I've also forced myself to use it with the layout of my screens. It actually makes sense to me for the way I use my phone and I can see why it will for other "non-power" users as well.