I used to attend 12 step meetings years ago. Even bought into the whole "disease" concept, especially with alcoholics. My family is loaded heavy drinkers. Some have even died as a result of their chronic drinking (My maternal Grandfather and an uncle on my Father's side). Growing up, we might not have had enough to eat, but their was always plenty of booze. My Dad ruined his health drinking. I used to drink beer as a young kid. Yet, I'm not a drinker at all as an adult. Complete t-totaller. Two drinks and my body just shuts off. So much for heredity and alcoholism.
I do not believe it to be a disease at this time. Why? Because there is no formal physical diagnosing. If alcoholics are "different" biologically, then why aren't there tests done to confirm their abnormality from the rest of the general population. When one suspects they have any other disease, there is usually a test, or battery of tests done to confirm such a diagnoses.
For instance, there is suppose to be an actual difference in the way the brain of a potential alcoholic develops. Well, ok, fine. Yet, when one goes to a treatment center, no brain scans are done to, indeed, see if the patient's own brain has developed in such a manner to support the diagnoses of the "disease" of alcoholism.
Diagnoses is determined purely by behavior alone.
Can you imagine anyone who suspected they had cancer not undergrowing formal medical testing?
However, I do believe that Alcoholism is disorder and a powerful one at that and AA can be of tremendous support to those have a compulsion to drink to their determent.