It works great. You are pure Genius. I would have never thought of specifiying the -d Q:/Photos/%Y_%m_%d/%Y-%m%d-%H%M%S in format in this way. I only downladed Exiftools yesterday and have only spent 16+ hours trying to figure out the syntax and make it accomplish my reorganization of 63,000+ files.
Is the user-defined tags example you provided worth trying?
My next step is to try testing using the -r and to also process not only the JPG file but also the CR2 files.
Did you have a way to combine steps 1 and 2?