I gave up 90% of my alcohol consumption for lent last year and it makes a huge difference.
What I have noticed is that I can enjoy a glass of my beer now with a much better appreciation for the flavors and the work that went into it.
Aside from losing 10 pounds without effort, you force yourself to take another look at drinking. I still went out and was social, but I just had iced tea (the sacrifice isn't something you just parade around while you're doing it) and had fun.
The lesson learned, however, was that my need to get a beer wasn't really founded on anything other than this weird obsession with the craving of getting a beer.
"Moderation in all things" is a good point to have.
I homebrew and I love the culture around craft beer, but less is more, and I'm sticking to the cliche. Even now, I don't drink nearly as much, I feel better in general, and when I do drink, I'm paying much more attention to the beer and all the flavors.
If anyone is worried that they are drinking too much, they should stop and think about what context they are drinking in
Are they trying to escape a bad day ("man I need a beer" or using it to cope with some negative event), are they sharing a beer with friends and being genuinely social in their drinking, or maybe you're just a massive geek trying to peg down all the different flavors in a beer. Regardless of whether you have a problem, the kind of reset in your mentality can bring some great changes to your life, and maybe you can stave off man-boobs and beer gut a little longer!