I mean, I only use my browser, Gmail client, sometimes Twitter app, whatever thing I'm keeping myself entertained with at the time (SNES emulator right now), file manager... and that's pretty much it. I do use Steam app, IRC client and Skype when I'm not around PC for a long time, but I can definitely do without those. So yeah, I don't need too much.
I own a Nexus smartphone so most my apps are from Google (e.g. Google Play, Google Books, Google Calendar and GMail). There's a music player - and who doesn't need a music player, anyway? I downloaded a few other apps to read PDF files, read emails in one go, watch videos, play some games and learn basic Nihongo and Korean. I refrain from downloading too much lest my phone's memory collapses.