Tacitus Welcome to SR. After reading your post I think that your experience is not typical compared to most folks who drink a lot for years and then try to quit. Maybe you are just lucky but I think you are wise to be concerned about some sort of relapse. Your brain has been smothered in alcohol for almost 40 years every day. That's got to have some impact on how it functions.
I wish you the best and success in recovery. If you find yourself having challenges staying sober you will find a lot of support here. I look at this site almost every day. If on the other hand you find sobriety to be "easy" please report back occasionally. Your experience is valuable to all of us.