Well, I am a native speaker. I use 别提多...sometimes,so it is OK if you use it in daily conversation, in fact this expression is often regarded as colloquial.
I think 别提多...≈It is VERY+adj..No special condition.But it stress your feeling.Like this one:
我刚从栈道下来,上面人挤人的,别提多危险了。It means the road is so narrow and crowded that the man thinks it is very dangerous.That's it.