I am an arms warrior and this has proved quite useful. For pvp purposes my battle and berserker stances equip a 2h axe with savagery, and defenseive stance a shield and a 1h axe with executioner. Sometimes vs rogues I tend to go to D stance and disarm them, or maybe to spell reflect a mage or somthing. If your lucky your auto swing will proc the enchant. When you switch back to a 2h wep with savagery, this means trouble for any squishy. My point being if you routinely switch weapons in combat, if your lucky, this trick is pure gold.
Edit: Just noticed someone else posted something similar...Oh well.