I see where you're coming from Leec, those are good points. I feel exactly the same about saying '(God)bless you' as you do, its an unnecessary practice which comes from a silly medieval superstition. Now, at least in the UK, there's no obligation to say 'bless you', it's not expected of us, although if someone says it to us, it's at least polite to say a quick 'thanks' rather than ignore them. I also stopped saying it a long before the WT got up inside my head.
However, some thoughts on these petty rules from an international perspective : I spent over a year and a half working in Turkey, and they have a completely different view of 'bless you'. If someone sneezes, there IS a VERY strong social obligation for you to say 'çok yasa!' or 'bless you!'. So much so that people would think you very rude not to say it. I found myself saying it now and again to placate expectant girlfriends, friends, students, co-workers,etc. The same goes for if you sneeze and dont dont make some kind of reply showing gratitude for their saying 'bless you'. JWs were made legal in Turkey not so long ago? The 'Bless you' thing will cause them big social problems on an individual level, and will unintentionally promulgate the idea that as a religious group they are ignorant and uncaring.
This is the kind of petty little WT regulation which may not seem like a major test of faith to adhere to if you are sitting comfortably in a luxury apartment in Brooklyn, but could impact surprisingly heavily on your life if you are a JW in other countries. What's to say that not toasting the bride and groom in some countries wont cause grave insult and even a danger of violence breaking out?
These kinds of small-minded, petty regulations, which the WT seems to add to on a regular basis, must be one of the main reasons JWs have such a high degree of mental illness and alcohol abuse issues. You simply cant keep up with them all! I always remember when I was going along, the WT meetings stressing time and time again that 'the yoke' that Jehovah put on us was 'light' we werent bogged down in the same ceremony and tradtion as 'Christendom', hahahahahahaha!!!!!