There's more to the in camera JPEGs than you might think, the Fuji engineers have baked in some grain, the curves applied respond to light levels, the highlights falloff in the Acros setting is always graceful, those little files are remarkable I think.
Now like everyone here I use my RAWs mainly... but... I shoot RAW+JPEG, I have set a few settings I like per simulation and mapped these to various presets in the Q menu. I love the Acros+Y filter when I am shooting landscapes and flip between it and the Chrome for events. It is wonderful to see a monochrome viewfinder when I am shooting. I have a most RAW like preset set up (ProNeg Std with things turned off) for when I'm shooting a portrait or particularly color sensitive shots.
For one off images I work on the RAW but If I shoot an event for someone, nine times out of ten, I send them the JPEGs straight from the camera. The prospect of editing a couple of hundred RAWs after a night at a show or simply selecting the JPEGs and uploading them, the JPEGs win every time.