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There is little or no use to the user for most of this stuff.

These are all features of modern smartphones.

Mapping screenshot: Quick redisplay of last map without having to turn GPS back on and re-resolve location
Geotagging: Great feature, all your photos know where they were taken, answering "Where were we when we took this?" Some programs will show a map with your geotagged photos overlayed, pretty cool. IIRC, the iPhone will even record the direction and angle your were pointing, which is good fodder for a program that builds larger images from smaller ones.
Browing history: Helps you go back to where you were. I use this instead of bookmarks quite often. This was a selling point of the latest Firefox.
App screen snapshots: Instant redisplay of app again, before it gets completely started, helps keep the impression of a fast, responsive UI (a fast UI is mostly subjective, and Apple puts a lot of effort into making UIs *feel* fast even if they aren't).
Keyboard cache: Very useful to auto-correct, and to keep you from having to type long words over and over.
GPS to find the kid: This is a feature of the modern iPhone, accessible by the user, meant to be used for lost or stolen phones. If you have permission, you can locate any iPhone. Even without a smartphone, the cops can always get the phone company to locate any phone even if it's turned off (they can wake your phone as long as it has a charged battery in it).

Each of these features is bound to have people who think it's useful.

App screen snapshots: Instant redisplay of app again, before it gets completely started, helps keep the impression of a fast, responsive UI (a fast UI is mostly subjective, and Apple puts a lot of effort into making UIs *feel* fast even if they aren't).

The illusion would be dispelled as a cynical ploy the moment I tried to type into, or menu navigate on, the "instant" app and found that I had to wait before it responded. Especially if it wasn't just one app that seemed to "freeze" upon appearing. Windows and most Linuxen do this the right way. What you see is what's ready.