Yahoo Aviate isn't a traditional launcher but rather a homescreen replacement. There's no upkeep, no real messing around to see that everything's in its proper place. This app will do all of that for you, organizing both your homescreen and your apps to make them more timely and hopefully more useful to you at any given time. It's designed to help you stop digging through a cluttered app drawer for a particular app and show information that you'll need, like your morning commute time, or upcoming appointments at work, or media apps and widgets when you're using headphones.
Yahoo Aviate isn't exactly a seamless transition from a previous launcher, and it may take a few days to get used to, but the longer you use it, the more Yahoo Aviate will adapt to you habits and your life. Swipe functionality in Yahoo Aviate also changes with your homescreen throughtout the day, but a few gestures stay the same, such as swiping up to see your most frequent contacts.
Aviate started as a launcher under ThumbsUp Labs, but was bought by Yahoo and renamed as the Yahoo Aviate Launcher at the beginning of 2014.
Yahoo Aviate is free, and if you're willing to give it a few days to grow on you, it just might surprise you.