I've been shooting RAW + JPEG, figuring that if I 'nailed' one, I wouldn't have to fiddle with the RAW file.
NOT!

I have to admit that I've never been able to keep my hands off the RAW file, even if it is only to tweak the exposure 1/4 stop or set the black level up a bit. Also, because I know that I'm shooting RAW, I never bother to set the white balance on the camera to anything but Auto, and sometimes even remember to take a shot of my WhiBal, for later reference, to 'click-balance' in ACR.
All in all, the in-camera JPEGs have turned out to be excess baggage. Even when generating JPEGs from the RAWs, I usually use Dr. Brown's 1-2-3 PS script, which lets me churn out thumbnails, medium (max 500 or 800 pixel for computer display), and large (full size for printing, etc) JPEGs, and plop my copyright notice in all the files, as well.
Point being, if I have to open up all the JPEGs to insert metadata, I'd like to do it just once instead to the RAWs, and have it trickle down to all my generated JPEGs from there. A lot less effort, and it error-proofs a part of the process (no 'escapee' JPEGs with no copyright or contact info).
With a little more encouragement like the posts above, I'll probably be ditching the RAW + JPEG 'crutch' as well, and just go RAW only, which is what I did when I started out with the original Digital Rebel (which lacked the capability), a few years back.