It depends on how much you invested in the religion and how deeply you believed in it and how much it affected your personality.
After all many people give up careers they worked hard for without a backward glance.
Some just come to view it as another religion not to be believed in.
Some people get over things more quickly than others.
I think that continueing to come here, long after you have "left the WT building" is a sign that you are not yet healed, and have issues you need to discuss and think about.
Once you have had therapy, and have successfully dealt with your problem, you don't keep paying to go for more.
I think a good indicator of healing is that the frequency of posting declines, and the posts get shorter.
Also as issues are revived by newer posters, you don't feel the need to repeat yourself.
Some continue to come here because they find online friends and support. others because they want to be there for newbies that need help.
I think in many cases just drawing a line under something and saying IT IS OVER is a great way of getting on with life if you can.