As so many things "ex-JW" comes back to labelling. I'm always interested in how people define themselves (I'm Todd's Mom, Julie's Dad, Mark's wife, etc.). I think in this situation both Minimus and Joyzabel are correct, but only if you look at it from different standpoints.
From a pure semantics, Minimus is correct. Most of us were JWs or identified as JWs and now we don't, so ex-JW from that standpoint is correct.
But what does ex-JW mean? What is the connotation of the label? For some, it defines them, and could possibly limit the healing and growth necessary to truly leave the org if that's what they want. I don't think it's so much denial on Joy's part as wanting to be free of a term that limits her definition of herself (of course, I'm only going by what I'm reading and certainly am not speaking for Joy, simply trying to make a point).
Labelling by it's very nature doesn't always foster change or portray an accurate picture of the person we are. I don't call myself an ex-JW, personally, because that would denote in my mind that all I was was a JW. I am a person who is many different things, and have evolved over the years. My JW experience was part of that, as was my upbringing, my parent's divorce, my successful and failed relationships, my work and school (life?) experience, and my parents' deaths. All of these things became facets of "ME" and that is a work in progress.
So while I understand how others might define me as ex-JW and would be correct on the most basic level, it really doesn't explain who I am, or the composite that makes up me.
Just my 2 cents.