I'm not an alcoholic, but I definitely was a binge drinker with a really poor relationship with booze.
Other than the amount of time you win back without it (seriously, you don't realise how much time you lose whilst pissed and on autopilot for days after), you realise things about yourself and your personality.
I've been out a fair few times sober this year, and realised some of my problem was a bit of social anxiety. I'm quite a chatty person but the need to almost have a prop in my hand like a pint or a cigarette. Quite a fast drinker so that can turn into a 20 or 30 drink night on the piss. Now I'll have 3 or 4 pints of diet coke and be ready for my bed. You do become the taxi service home for your mates though.
One thing I hated when drinking (I only drinked to excess, blackout drunk or none at all), was the feeling of dread the days after a session when you're piecing together what you've said and done around people you know. I got that same feeling of dread walking back to the car after a sober do last week. That must be years of binge drinking that's conditioned me to feel like that.
You maintain your authenticity and your dignity when you have control of your sobriety. That allows decent relationships to flourish and not so decent ones to die out. As I say, by no means am I an alcoholic but I did have a poor relationship with it. 12 months ago I was feeling like a kid opening their Christmas presents when I had a pint of Guinness in front of me, and trawling pubs after last orders for "one more beer mate, come on". Quite proud of the progress I've made and feel quite confident saying I'll never have a drink again in my life.