Photos and videos chug through space, most of my iPhone-owning friends have to resort to deletion of old photos at inopportune moments when they're trying to take a new one. I know that it's easy to push old media off onto a computer but it seems that most people never sync their iPhones to their hard drive.
It is pretty silly but also annoying as the iPhone has a strong following due to its "it just works" design. Girls in particular love it for the camera but 16gb just isn't enough space to get my SO and her friends past a few months of photo-frenzy.
Music and games and applications, my current phone has 23GB of each with ~10GB for on-the-spot stuff. I don't carry my photos library on my phone because there just isn't enough room, and the music library is a subset of my complete library.
The 128GB internal option is the one which'd make me actually consider an iphone 6.
My wife and I had our first child at the beginning of the year. The desire to photograph every second is very real, and photos burn up a LOT of space given these modern phones with their super high res cameras these days.
Not starting with 32 gigs seems like a bean counter somewhere trying to be clever and force more people to opt for the higher storage (read: more expensive) versions. Might just be my tinfoil hat talking.
Not GP, but my Nexus 4 is perpetually at its limit, filled with podcasts and a small selection of my music. I spend a lot of time in areas with a very poor signal, so streaming isn't useful to me.
Personally, I want a MicroSD slot because that way we both win.
