I was first df'd in 1980 for apostasy (prompted by 1975). Not much thinking involved, mostly an act of protest. I was out for about 2 years, and first read COC in 1985. Actually, it made me so angry I almost got sick, and I threw it away. I still had hopes that WTS would change and just didn't want to believe what Ray said.
My wake up call started in the early 90s, when I went to college for retraining. Had to take those pesky elective courses (you know, sociology, philosophy, all that "worldy" garbage) and hoped for nothing better than to get them over with. Boy, were my eyes opened! Like you put it: "a broader outlook and level of knowledge about the world in general." Always thought I was reasonably intelligent; little did I know what a narrow, shallow-minded viewpoint I'd grown up with.
The "generation revelation" was my last straw, but this time my decision to leave (for family's sake, tried first to just fade) was based mostly in seeing that WTS is just another mind-control religion like so many others, and that the history of those other religions gives little hope that WTS will ever fundamentally change.
I have no doubt that I would have left for good 20 years ago if I knew then what I know now. And yes, I got another copy of COC: this time I'm gonna keep it .