You will be surprised by how easy it is. Take the approach I suggested. Wane yourself off of it and don't quit entirely until you feel comfortable with it.
I help out with an Art open studio event.
Its really starting to be the case that people who are organizing events want to let members know about events and invite people via Facebook. We use that and email. Facebook is easy and somewhat effective.
Some people use it for their whole social calendar. This is different from the old evite.com days, which was more email list based.
I'm not on it so Facebook, but my Partner is so she keeps me posted on the social aspect of whats going on. If she wasn't I probably would have to be. Not being on it means stuff happens and I won't know. I'm ok with that, but it can be a bit isolating. There is only so much you can expect acquaintances to work to keep you in the loop.
People like that its free (not like the services you pay for like meetup.com)
I'm not interested in doubling or tripling the amount of time it takes to manage my social calendar and I find your comments that seem to be treating it like it's some kind of addiction to be a tad condescending for those of us who would close their account in a heartbeat if it wasn't such a necessary tool.