I haven't yet deleted my account, but I've been about 3 years 'clean' of Facebook - only dropping in briefly on my birthday as I know people like to wish people a happy birthday there.
I've made a real effort to actually connect with the friends I love and want to spend time with, and to text, call, email, write or visit them - all of which are much more impactful than a 'like on fb. I've 'lost out' on interacting with the huge group of friends that I had on Facebook, but you know what, they weren't friends, they were just people I knew or knew of. My real friends I've actually spent a hell of a lot more time with and on. And going from 500 to a 1000 people to 10 to 20 certainly felt like a downgrade at first but within a few weeks I was obvious that it was vastly better for me.
Although happy and successful in many ways, Facebook left me feeling anxious and like I wasn't keeping up. With things that I didn't care about. Talking in person removes all of that.
I've not yet deleted as I've not yet bothered to pull all my details off there, and I like to return just to tell people that it is OK to leave the party ;)