JohnR1975 is on to something. For those who understood what was happening and left on their own accord, seem to more quickly deal with emotional aspects. For others for whom it the leaving was accompanied with a sense of powerlessness, it lingers far longer. I personally never felt anything like hate. I felt relief, I felt sympathy, I felt irritation with some overzealous individuals. Having researched religion, not just mine, gave me perspective. If I were to hate everyone who believed in myths and stories, I'd become a hater of mankind.
As far as 'thinking about them' after decades out. It has been a useful experience, we've helped a number of people similarly abused by other religions, much of it crosses over. Also,I have hoped that a sober approach to studying the ancient religion of Jews and Christians has been of value for others. This site has helped many, as long as we don't use it as a weapon to stir hate or as a megaphone for divisive politics, it will continue to help many more.