I deactivated my Facebook account several months ago, and it's been about 90% great, 10% frustrating. It's great for all the obvious reasons (less timesuck, less compulsion to endlessly scroll your life away, no notification interruptions). The frustrations are real, though. Primarily it's around events and photos. There are some communities I participate in that regularly organize events through Facebook, and now I…
As far as events go, the neckbeard in me hasn't actually minded. I still get invited to "high quality" events (things my real-life friends are going to) and haven't really missed the lower quality events.
Photos I just conveniently had solved by having all my photos on Google Photos anyways (I stopped trusting offline storage long ago).
I think my Facebook account is reactivated at the moment (due to logging in to search for something) but I disabled notification when I'd originally left and haven't looked back. Life's easier (and way more productive) without the Book.
Interestingly, I still find a lot of value in Messenger. But they've split concerns so you can use that without reactivating your FB account.