Excellent question, touches on a topic that's all too often a "taboo" in wine forums and clubs.
I was reflecting just the other day that the more years I spend as a wine writer, the more I enjoy wine
and the less of it I drink. Because I don't mass-review wines but simply write short tasting reports and short and (one hopes) educational articles on three or four wines a week, I don't really "need" to open more wine than my bride and I can enjoy with dinner - more than the average "civilian" perhaps since we'll often open two bottles to serve "single blind" to keep my opinions honest.
But what I'm finding is that, while I enjoy the wine very much and will work on a glass analytically before dinner, then both analytically and for enjoyment with appropriate food for dinner, and usually sit and contemplate it a bit as we sit quietly and relax after dinner (and sometimes even re-check the partly finished bottle the next day), our joint overall consumption from an average bottle is often little more than one glass. I wouldn't be surprised to discover - if I measured it carefully - that some nights I actually consume only one ounce. And yet I love it, and if anyone asked me, I would certainly deny that I don't "drink" wine.
As a younger man, I did my fair share of over-consumption, as just about all guys do. I could tell some tequila stories - well, let's not.

But for some reason I find that, while I don't mind the slight pleasant relaxation that comes with a few sips, I really dislike the out-of-control sense that comes with drunkenness; and the morning after is not even to be thought about.
That's just me - your mileage may vary. But I do find it funny that the more different wines I
taste, the less of an individual wine I
drink. A horrifying amount of excellent vino goes down our drain, and I don't regret that. Maybe it's an age thing? As a graying Baby Boomer, I'm simply recognizing that I don't "need" as much?