I used to feel sick and shaky when I saw them. I rarely see any I recognise now so not sure how I would react if I met one I used to know. I can talk to ones I don't know at my door no problem now.
I would greet any from my past and not mention the JW thing and treat them like "a normal person". If they brought it up (you know they would lol) I would just say I haven't been to meetings for a while and change the subject. I hope I am well past the feelings of sick and dread after 9 years of abstinence.