Dancing

I'd like to ask about Bid'ah in general. I see that many Naqshandi sheikhs encourage the zikr with the jumping in a circle. Is this halaal or bid'ah?
I'm not a Naqshbandi but this topic came up in a debate with many friends as it is becoming prominent in Johannesburg already. I'm aware of the hadeeth where the Prophet (Sallallahu Alayhi Wasallam) said every bidat is a deviation and every deviation leads to the fire, but a friend told me that Imam Shafi (Rahmatullahi Alayh) distinguished good bida'ah as good and bad bida'ah. I have never read or heard any of our shuyookh refer to that. I would sincerely appreciate your ruling on such a matter.