Yes, good ear!
Indeed, I was that caller.
They recommended that I check out this website, and so I have. 

If anonymity is NOT a major concern for me, then perhaps I should be using a different desktop wallet instead of Qt; that way, I only have to worry about one address there, and not several change addresses.

Any good recommendations for a different Windows desktop wallet that also updates the full blockchain constantly?

Sorry for all the questions, and thanks again for the help!