Remember that your habits change over time. Years ago I thought my 32GB iPod touch was waay to much. I had 500MB of music, 3GB of apps, amd like 2GB of video.
Over the past three years I have grown significantly. I have 9GB of music, 13GB of apps, 1.4GB of Photos, amd 150GB of video. My 32GB iPhone was annoying from the lack of space. I now have a 64GB iPhone 6 (kind of wish I had 128GB since I keep a lot of space free for photos and videos taken on the device) and will upgrade my 64GB iPad 3 to 128GB.
I like to carry around a large video library. Like a mobile TV. Plus I like to have room to grow and for system/app caches. For example, my reading list is like 500MB right now.
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My aunt lives fine with her 16GB iPad 2!