It works, and is quicker and on the whole easier than doing it in the skillet. Watch out, though. You have to use enough flour to pretty much cover the bottom of the sheet pan -- and more than a fine dusting -- or you risk burning it quickly at the edges.
Incidentally, Paul Prudhomme's cookbook A Fork In the Road discusses this method, and as with all his cookbooks everything has been tested a zillion times in a home kitchen, so if you want more detail that's a good place to look.