That's you, because for me, I've never needed more than a 16GB ROM smartphone, with 86 downloaded apps, Sygic Navigation with 3 States Maps and My Movies PRO with all my 250+ movies database, and the rest of OEM stuff, I still have over 8.5GB available, why do I need to think that 16GB is a thing of the past? If they offer a 32GB for the same price than a 16GB then I'd get it, but while I still have the choice to save some money, no matter how little, it's good for me.
My Pictures, My Music, My Videos and all the different stuff that I want available when I switch phones are in my 32GB SD card, and even in that I still have about 17GB available.
So, again, in your case if 16GB is not enough, then go get a 32GB phone, good for you, the same goes for me, 4 Ultra (Suma, Supra or whatever they fancy to call it) pixels is not enough, simply because I use my phone as my only camera, and I do want to be able to use a great photo and crop it, edit it and create my 8x10's from it...So I get the phone that gets me what I want, and that's the S5.