When I was out for nearly two years, a sweet old lady I worked for had a surprise for me one day... she had two JW's at the door and accepted a Watchtower and Awake... She thought it would be fun for me to see this, but the second I saw it I got pain in my stomach. I couldn't even get my self to opening them and read... it just made me sick. I told the lady that I understood why she took them and that I appreciated her thoughts of me, since she was only trying to help me and have some fun, but that I wouldn't read them. Later we did have a laugh about it, but the initial feeling it gave me was horrific. Like something awful tried to jump inside my head...
A couple of weeks ago when JW's left their tract in our gate it was the first time ever since that I read something from the WTS. It wasn't really upsetting, but it did give me a couple of funny feelings... knowing that I used to spread things like that (well, actually the tracts in my days were 'a little more' intelligent...)... Like Simon said, it's conditioning that is still there, faint... but still there.