I think it would depend upon several things related to the experience, dear mankkeli (peace to you!), including, but not necessarily limited to:
1. The nature (good or bad)
2. The length (bible study for a few months vs. an full-fledged baptized publisher for a number of years)
3. The time of onset of that experience/indoctrination (as an infant/child vs. an adult)
4. Family/friends' experiences (particularly if they are still in... had a bad time of it when they were... were elders/Bethelites, etc.)
5. Where you are with your life now (what you are/are not doing NOW)
All of these, and perhaps some other factors, can dictate what you will remember, if anything... and to what extent. But you CAN choose how much you will LET any of these effect you... including your memories AND your future. You see all bad, if you choose... as well as choose to let doing so effect you and your life negatively. You can choose to see all bad... and, yet, choose NOT to let it have a negative effect. You can choose to see all GOOD, too, if you so wish.
Or... you can be truly realistic and ALLOW yourself to see BOTH.. the bad AND the good (and there is some of both, although not necessarily in equal proportions)... and then CHOOSE what effect you're going to let EITHER have.
If you've truly left the WTBTS... then your life is yours. And you can do whatever you wish with it. Even give it to another. If, though, your life is still NOT yours... to do with as YOU wish... then you have not truly left. Not TRULY. Sure, your body may have left, but some part of you... some part of your HEART... still remains with them... and so, in their control. Thus, some part, if not all, of your BODY still remains with them, too. Because that is how they still dictate TO you... what you can and cannot do.
Again, peace to you!
A slave of Christ,