My Rank isn’t that important to me at all - in fact I try and avoid using it when I’m doing cadet stuff. I’ve found that in the majority of situations when speaking to adults “Hi, I’m Bob, pleased to meet you” as opposed to “Hi, I’m Flt Lt Smith” is more productive, and doesn’t make you sound like a prize throbber. I can’t imagine any situation where I might use Flt Lt (Retd).
As I actively shun the majority of uniformed social events (my Wing seems to specialise in organising the type of tedious evening that makes an evening sat in the local McDonald’s, surrounded by fighting chavs, seem like a glamourous affair), I doubt I will ever wear uniform once I’ve left.
That said, the right to use the post nominals RAFVR(T) Retd was one of those silly little benefits that was practically useless, but made you feel that the RAF/ATC were gratefull for the time and effort you have put in running a sqn/being a WSO, and was a tangible reminder of your service. I suppose it’s similar to the fact that I felt sad, and a little betrayed when the VR(T) commission was removed, even though I had no pretentions that I was on the same level as other RAF officers.