I think only other ex JWs could ever understand.
I think you're right. I have tried explaining to never-JWs what it was like, but they just can't grasp it. At most, some of them can only relate it to going to Church once or twice a month. They just will not be able to grasp how all-consuming being a JW is and the sacrifices that are made and the way JW lives are controlled and the never-ending hamster wheel of life-consuming activity. They just won't be able to grasp that if one is a real JW, he will always be behind and he will never have any free time - no weekends, no evenings, etc.
I have virtually given up on trying to explain. Many of my associates go to church once or twice a month. Outside of that, they do whatever they want whenever they want. Their careers aren't affected, their choices of education aren't affected, there is no preaching, there are no meeting parts to work on, there is no one scrutinizing their lives, etc.