You may have long since ignored this post, but I'd like to reply in case others are looking into the same question.
Like you, I love wine. Also like you, I find it easy to drink a bottle over the course of an entire evening. I don't do it every night, but I'd like to!
The problem with drinking every night is diseases like cirrhosis of the liver. You can otherwise be extremely healthy, but if you're exposing your liver to alcohol constantly, you are asking it to work extremely hard. A liver that battles toxins daily is more likely to develop cirrhosis, which is a painful condition that can be fatal.
A good friend of mine lost her mother to liver disease. Her mother was never drunk. She was a classy lady who looked you in the eye and spoke intelligently. Unfortunately, it was discovered that she had been nursing drinks over long periods of time in a day. This sounds a lot like you and me.
So, I completely understand why you feel like your habit isn't harmful. I'd feel the same way if it weren't for what I know about liver disease. That happens to be MY reason for cutting back.