I generally agree with what you are saying, but actually at wedding receptions it would not even occur to me to use the LS, or any other modifier that would reduce my flashes output significantly.
As good as the LS may be at close range, it will hurt my shot more than help it, on a dim dance floor or dark dining area. For anything beyound about 8-10 the output fall off is just to great with such a modifier.
Most of my dance work is done by bouncing the 580ex with the little card extended, or sometimes using the Lumiquest 80/20. Here is an example of a recent wedding with just the 580's own "index card. Keep in mind this is a PROOF, and other than RAW adjustments done in ACR, no PS PP has been done to it:"
http://www.pbase.com/sapearl/image/102290666
And again, here is another example of a candid shot, with no light modifier, of the bride "running around her house" during the pre-game festivities. Camera was set on manual with AUTO-ETTL for the flash:
http://www.pbase.com/sapearl/image/102290030
Her face is a little underexposed - something I will easily adjust in PS for her album print - but I adjusted the flashes output for her dress since I did not want to lose any of it's highlight detail. - Stu
Pearlallica wrote in post #6202559
Amen.
I think there's a time and a place for everything. One needs proper education to correctly set-up a flash assisted shot. When I pull out the lightsphere for use it's because my kids are running around and there isn't time to meter, adjust, aim, then shoot. Think of a dance at a wedding reception. The action is ever evolving. There are just too many calculations at play and too many opportunities that might be lost in the process. The LS is a point and shoot tool. 'nough said.