For me personally, I primeraly shoot weddings, in real time and generally I prefer not to use flash. If you have a bride coming into a church from a bright sunny day into a dark church with artificial lighting, you have a lot of light and colour changes to deal with in a very short space of time not to mention the backlight as she moves across the threshold, then you want to have the flexibility that raw gives you, there is no way you've the time to mess around with WB issues at the same time as your exposure, and in some cases iso changes your making on the hoof.
A few months ago while pphotographing the speeches I realised one camera was getting low on memory, but I wasn't close to my bag so I switched on to jpg for the last few minutes. When I came to the edit I had forgotten about this but instantly ran into WB problems, you can't generally set WB for a whole room and forget it, often the bulbs are mixed colour temps, and sometimes there's still some daylight mixing with the ambient, I find I have to tweak the WB as I've moved around the room. If you try this with jpgs they very quickly fall apart colour wise, as you get your yellow where you want it the other colours go off, raw is so much more stable and controllable.
If you never work in these circumstances then jpg is just fine, in normal conditions there's nothing wrong with jpgs, but any suggestion that using raw is a cover for sloppy technique is just arse.
