Tell me you want that after absorbing your 78th Dragon Soul as a Giant is heading right at you.
As a general rule loss of player control for any reason is a bad thing.

If there's anything I HATE is that someone ruins your cool moment (aka, I'd turn that giant into ashes as soon as I reload a new game....with a mace).
Still, when I'm bored I'm gonna check if by any chance they left that sound behind in the game files. It'd be cool to implement it as a mod (making the shout frequency configurable, of course).