I don't know if my experience is similar to anyone else's?! Looking back on things, I gradually stopped a lot of jw activity before learning TTATT. For the best part of 2 1/2 years before I first encountered the UN scandal I hadn't answered at meetings and only made a token appearance in service. Having our first child was great as i could now 'legitimately' count time without knocking on doors :)
I always felt I wasn't doing enough but at the same time couldn't bring myself to make more of an effort.
I believe I'd made a subconscious decision that things weren't right for some reason. Perhaps the monotony of it all just got too much, I've always got bored quickly when I was younger and remember the meetings droning on about the same old bs week after week. I don't think there was a week that went by when porn or masterbation wasn't discussed!!!
I totally agree with everyone though, the triggers seem different from one person to another. I guess it boils down to what TTATT someone is exposed to and what stage they're at in life.
The UN NGO scandal got the ball rolling for me... these days the protection of peadophiles is my no.1 pet hate of the org.