Two factors to keep in mind here: (Commenting on those desiring to "fade away"....others may choose an "in your face" type departure, but there are valid reasons to fade: Allowing for some contact with family members still "in", for example....
1. As others have said: Bodies of Elders vary in their agressiveness on this issue, but keep in mind point 2:
2. The less contact/influence somebody a "walk-away" has on the congregation, the more the elders will be inclinded to busy themselves with other things. Yes, of course, some bodies of elders will be way out of range with their effort to give you trouble, so this doesn't apply with equal force everywhere. But in my own case, and in others I know about, if you keep a low profile. When you see Witnesses in a casual setting, like at the store and you make insulting remarks or say things like "Oh, are you still with that damn cult?" you can count on it being viewed as a threat, and from getting pursued (Obvious to most of us, but I think it needs to be mentioned). A strategy that has worked for me is just being too busy to talk to them, with courtesy and politeness. Yes, we may have strong feelings about our former life, but for most of us, it's the system, not ALL witnesses/elders in general....
There are posters on this board who are have followed point #2 above, and who openly are leading lives at variance with what they did as Witnesses (celebrating Birthdays and Christmas for example), and yet are (so far) un-bothered by "witch-hunt" type activities by the elders.
My two cents.
----Dan