yes I have had a witch in the group .. and yes I have dealt with high level / High DC Slumber Hex - but even those only last Rounds / level + there are ways around it (if he has friends they can take a standard action to slap their boss and wake him up) and then he generally cannot be hexed again for 24 hours
this one is Days / level ... and restricts you to a single move action that if you cannot move 65+ feet in 1 move action AND if the scenario is not a "Fight till the death" Situation there is no way around it (mind affecting aside) AND its a 3rd level spell maybe Im missing the mark but there are very few total shutdown spells at 3rd lvl with a duration greater than rounds / level
This is a rough spell, but as was stated earlier, martial types can also end the BBEG in one round. Color spray is another save or suck spell that can end combat quickly, especially when paired with a Heaven's Oracle with Awesome Display. Anything can break a combat, but I agree with nosig that casters do usually receive the brunt of the "this is broken" conversation.