One day, a dialog popped up on Facebook suggesting people to put on my Acquaintances list, which hides most of their posts from my news feed. It improved my life.
Second that. Lists were introduced as a response to G+ circles just as the subscribe function was added as a response to the follower model of Twitter. Everyone expected a response from Facebook and they delivered. Then the features were left languishing and were never updated/enhanced. I don't know what's the rationale behind this, lists are actually a wonderful way to catalogue your "friends" and most people would find them very useful, if they knew they're available. Facebook should really consider to make them a more prominent feature and simplify the whole adding process.
Are you sure that lists were added in response to G+? I remember having lists long before G+ was even a thing. I could be mistaken but I'm pretty sure lists and the ability to share things among certain groups of friends had existed for quite some time but was rarely used.
It might very well be, I'm not an expert, I know for sure that they became a thing around the time that Google introduced G+ and its circles.
I think you just made Facebook useful to me again.