It is doubtful whether the fanatic who deserts his holy cause or is suddenly left without one can ever adjust himself to an autonomous individual existence. [...] An individual existence, even when purposeful, seems to him trivial, futile and sinful. To live without an ardent dedication is to be adrift and abandoned.
Firstly I don't think everybody who was a JW was a fanatic. However, I do know some who are. My ex was one of the fanatic ones. I wasn't. While a JW I probably gained much more of my sense of "me" from being a mother than from being a JW.
It does take time after leaving to adjust. As a person begins to realize the fallacy of their belief they begin to recreate. They often search out new beliefs/ideologies. Some become involved in education, career or hobbies (like computers, internet and JWD).
Many have taken up causes that are connected with the JWs and commit themselves to exposing the fallacies. Some work on JW policies that hurt people. Some are working on the blood issue. Others are working on doctrinal issues. Some focus on the relationship issues.
Passionate people will find new passions. Those who were just there without really believing it all (kids raised in it) are probably glad to be free to have a life.
I think the above quote would really apply to those who have left the JWs but retained the beliefs so are still JWs in mind only. They would be the ones who might be most likely to be "adrift andabandoned".
The rest of us are busy recreating a life.