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Other notable software tweaks on the S4 include the Smart Pause, however, due to the crowded nature of the event at which I was using the phone, it was hard to work out how accurate and responsive these features are — there was pretty much always someone looking at the screen.
However, I had more luck with the Air Gesture feature introduced for the Galaxy S4 which uses sensors at the top of the handset to detect when you are trying to scroll through things. For example, if you want to scroll through pictures in your album or different music tracks in your collection, you just need to swipe your hand left or right in front of the handset and it will move along to the next item.
Obviously, for this to work you need to be relatively close to the phone but it'll still work from a few inches away.