The main issue, at least for me, is that everything social that is happening is arranged through Facebook. My kids school events, social events in the town i live in, hell even the good old paper adds from our local grocery store has been replaced with posts on Facebook. Everything is announced and coordinated through Facebook.
So going "cold turkey" is not really an option unless i want to be left out of everything that is going on. That doesn't mean i don't care. I don't have the app installed, and usually don't browse it on my phone. Instead i limit it to "checking todays news" on Firefox (with facebook container) on my PC at home.