In iPhone and iPad use, where does the space usage come from?
My 64GB iPhone has several hundred apps on it, mostly games, about 9GB of photos/personal videos, 3GB of music, and ~5GB of free space right now. I do have to prune from time to time but it's not too bad.

My 32GB iPad on the other hand...I really wish I had bought the 64GB (the largest at the time). I am constantly having to juggle what games/apps are on there, and that's really what's taking the majority of the space. iPad-specific apps can get huge...even universal apps can. I've seen several 1GB+ games, and have a bunch that are in the 250MB to 500MB range. I have only a fraction of my photo library on there, and no music or videos to speak of.

I am excited by the idea of a 128GB iPhone possibly being introduced Tuesday, and when I have saved for a new iPad I will get at least the 64GB model.