I have 487 apps right now, and they all exist on one of two home screens (I’ve set it up such that my first home screen is empty, so that I can see my wallpaper unobstructed*). On that second home screen, I have 16 apps, and eight folders (plus the four apps in the Dock). Thus, 467 of my apps are distributed throughout those eight folders. My largest folder has 14 ‘pages’, and contains 120 apps. I’m not sure if there’s a limit on the number of pages you can have in a folder or not…
Managing all this became much easier when they added the feature enabling you to move multiple folders/icons at once. In case you don’t know, you do that by putting your home screens into “wiggle mode”, then start dragging a folder or icon with one finger, and then add other items by tapping on them with another finger or your other hand. It can take a little getting used to, but I love that feature…
I’ve not played with the iOS beta at all, so I’ll be curious to see how the App Library affects my layout.
*An additional cool aspect to having an empty first home screen is that your apps all magically ‘disappear’ when you swipe up on any other home screen. 