Hi paul and welcome to the A/P forum.
While I am not ready to say that NA is a bad program that is dishing out awful advice to all people...I will agree that the person you talked to was sorely misinformed and seemingly not very educated in regards to safe tapering off of a benzodiazepine drug!
Even with other substances like you mentioned in your post...one can't quit cold turkey. Alcoholics often have to detox slowly to avoid dangerous side-effects...and some drugs/medications could have serious (or even fatal) withdrawl issues if not weened from in a proper manner.
I am glad that you saw clearly that you had been given bad advice, and that you are continuing on your safe schedule of tapering.
I would consider calling and asking to talk to someone in charge at the NA hotline...I am sure that most of their people are volunteers..and perhaps are in need of more information and training. You could help assure this happens with your feedback.
Here is a website that you may be interested in looking at....I am sure that it will reinforce what you already know about
benzo tapering...but worth a read anyway.:)
http://www.theroadback.org/
Thanks and post with us anytime,
Scaredy Cat