You know, when I got my first 5 inch device, I thought it was much too large. I thought it was bulky and it felt really odd in my hand. Now however, if you tried to give me an iPhone 5/5s or an equivalent sized phone, I'd think you gave me a phone designed for children (in size only, that's not a criticism of the phone quality or software). I can just about guarantee that if Apple released a larger iPhone, you'd grow to love it and never want to go back. Indeed, I now feel the same way you each feel about a 5" device - you want to give me a 4" device? Hmm, no, I'm good.
To each their own I suppose. I could be way off but most people I see come to love and grow into the phone. In fact, I tell myself this every time I see a reviewer say "the Galaxy Note 3 is huge but the size is amazing."