Control who sees what
You know exactly who is going to see your content. You know on what basis you're seeing content. Not everyone sees everything you put by default.
Control what you see
You don't have a thousand irrelevant things in your feed. You invite the people you care about listening to, you follow the people and things you are interested in.
No more creepiness
You won't be able to see what your friends are commenting on or interacting with, live. You won't know what your friends are bookmarking or watching. And that's all right.