I have wondered this KW. I am not that long out of the org, and still have some issues regarding my so called bible trained conscience to deal with, little guilt feelings about some of the things I do now that I wouldn't have done as a jw. My boyfriend is also an ex jw, but he's had almost 7 years away from the org, and you wouldn't know he'd ever been a witness unless he told you. We live together, and have no concrete plans to marry as yet, and that makes me feel a little guilty at times, but it doesn't worry him at all. He does, however, use the odd word that he didn't use before he was a jw, so it's not all gone, and maybe it never will. As for me, though I know for certain it's not the truth, I still have quite a bit of jw ness in me, although its fading.
I guess spending so long in a cult, 25 years in my case, is bound to leave marks that take a long time to fade, maybe even a lifetime.