I don't really remember what it was like before I started drinking, so I can't comment on whether or not it goes back. But I can tell you that not drinking is a hell of a lot better than drinking. That's why we strive to stop - and stay stopped!
Unfortunately for me, cannabis makes me paranoid 100% of the time. I tried it in the beginning to take my mind off of alcohol, but ended up miserable with horrific paranoia. Unreasonable and obsessive thoughts about my job, relationships, finances.. Holy smokes!! My brain completely freaks out.
I just enjoy each day for what it is - and if I don't like it, I try to do something to change it.