I shoot RAW and seldom, if ever need a JPEG SOOC. However, when I visited my wife's family in Texas, I wanted to leave them some JPEG images so I shot RAW + JPEG and downloaded the JPEGs to my sister-in-law's computer.
However, with the in-camera RAW conversion to JPEG that is now available for the Canon 7D through the last firmware upgrade, I could have done some rough post processing on the couple of images that I was leaving with them...
https://www.youtube.com/watch?v=_JOYXgint3U
I cannot see any other way I would use that capability which is also available in the 60D, 70D and 5Diii. It would be a lot slower since I batch process many of my RAW images...