Could it be? Is my iPhone once again completely sane? Seems so.
I even played music this evening for 30 minutes (Robert Plant and Alison Krauss with their awesome Raising Sand) while making up a big bowl of my rather spectacular Mennonite Chicken Soup :-) ... and the battery remains full.
Apparently, I have the cure ...
Edit: As of July 6, we're above 84 hours and the battery still shows full! Not a lot of usage, but *incredible* standby time ... I am so thrilled.