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.