Is Assembly Language worth learning?

I've heard that learning assembly language is a good way to become a better computer programmer. Is this true? Is it worth the effort? Does anybody have any suggestions on this subject?

Any programmer worth the name would be able to quickly comprehend what an inline asm block is doing. Gone are the days where we could pull bizarre self-modifying code trickery, kill debuggers, rewrite interrupt vectors, etc.

So that's an utterly stupid idea.