I use a basic set of apps: Twitter, Youtube, GMail, Flipboard, the core Android apps. Most of these came bundled with my Galaxy anyway so I can't actually get rid of them (you can only disable bundled apps, not remove them completely). Use Strava to track my time, distance, route, etc. when I'm biking outdoors.
Added Google Cast to a couple of our devices yesterday since we bought a Chromecast (basically making our Smart TV smarter) which in turn means a couple new apps for streaming video services, which are the reason we bought a Chromecast in the first place.