The Game Commander webpage (http:\www.gamecommander.com) has a good profile for voice control in CM, I started with that and made a few changes, and I was quickly in business.
For me, it just makes some things easier in CM, and lets me be lazy and say things while I lean back holding only the mouse pondering the battlefield. Fun, useful, compelling, good for any arcane keystrokes, but not essential. In flight sims, it IS essential.