The 5d2's AWB is abysmal.Can't agree with that. I shoot hundreds of AWB shots every week and they take very little tweaking, until you get into a particularly low light tungsten situation.
Compare that to my friends d3s and it's night and day as the d3s is truly dreadful.
Who cares about white balance.... You guys should be shooting raw, the quality of the WB from the camera is totally irrelevant.
I am. What concerns me is the extra 1/2 to 1 hour per wedding I need to spend in post if the WB's are all off.
This is a time concern not a quality concern. Every pro should care about the amount of time they need to spend.