Coming back to iPhone from Galaxy S4, one of the things I've really loved about having iOS again on my phone is the reminders app. It's so simple, but so useful. It does only what it needs to and does it well. I love having different lists for work, home, travel, etc. I love the sharing ability. Georeminders are awesome. I never used the app too much when it first came out, but incorporating into my daily routine has made me more organized. I used to Evernote for these functions (still use it heavily for other things), but find Reminders better for these uses.