Hi James
Great W&B conversion practice.
I felt a bit like you re. RAW / JPEG and shot both for a short time (a week?), but it took more disk space than I just RAW, and JPEGs were completely unnecessary. Deleting them now is proving a chore, as I have to check whether I have a matching RAW file for the JPEG I'm marking rejected.
You can do all the same things with RAW files as you can with JPEG, only without the loss of quality. I could see that pretty quick and had my dad who's semi-pro but a total technology dumbo to reassure me of this. I thought if he could get away with using just RAW and if he can use Lightroom and Capture NX2 (which we both use as we're on Nikon RAW format), so could I! I've never looked back.
At first, I switched to JPEG only when I took photos for eBay, but I got so quick at editing RAW and so annoyed with trying to edit JPEGs where adjustments were necessary that I stopped using JPEG even for that pretty soon on. Plus, at times, I forgot to switch back to RAW from my eBay-only JPEG, and found that I just took a load of precious shots as JPEG-only, so I don't bother using JPEG for anything anymore.
In addition, the size of RAW files encourages me to pay more attention to what I shoot and what I keep also, forcing me to mark my rejects as rejects straight away on import and remove them all regularly after I back up.
Afraid not. RAW's a blessing, not a curse.