I don't like how large phones are now and manufacturers don't seem motivated to make any flagship phones small because nobody minds carrying around a phablet for some reason inexplicable to me. Like you, I've thought about going to a dumb phone and even Googled around for "smallest phone in the world" etc.
What brings me back to needing a smartphone that is, unfortunately, large, is the insane amount of crap I can get done on it. I need a smartphone to:
- Capture great photos and videos of my kids
- Map to destinations (I drive around a bit with my job, taking kids to their friends' houses, etc.)
- Music - I stream from RDIO while I work out and drive, plus when I'm in the garage, at parties, etc.
- Email
- Bank
I like a smartphone to:
- Browse the net
- Watch videos
Probably a bunch more, but that's just a few off the top of my head. Unfortunately, dumb phones suck at all of the above. Especially photos - I can't imagine not being able to take good quality photos at any time of the day or night with no hassle/extra equipment.