I gave up completely over 5 years ago and I was an 'enthusiastic drinker'. I usually stopped for a month or so after Xmas and New Year, this time I kept extending to see if I could.
You need to be clear about your reasons otherwise you won't be able to hold your nerve. I was getting out of hand and recognised the top of the slippery slope...
The benefits are: more money (unless you start a crack habit instead), less weight variation (probably nto a prblem in your early 30's but can be later. A lot of real pi$$ heads don't eat so their food is alcohol and they don't put weight on) and lastly, you feel fantastic the day after the party/get together/pi$$ up when everyone was rolling around. This is priceless
The downside for me; if I don't feel sociable (like being dragged to the Wife's Xmas do), I can't get into it when alocohol would used to help get me going. In these cases, I stay away and avoid functions I don't want to go to. Oh and lastly, pi$$ed people do go on a bit which can be both irritating and amusing.