Hear hear. I've needed them exactly once (in NestedMap) and a good rule of thumb is to not write any code that you don't need.

And before anyone says "why do you use strict and warnings then" - I need them to save me from my own stupid errors. I suppose that in theory I could remove them from my modules once they pass all their tests, but that means I have to put them back in when I change stuff later, and it also supposes that my tests are perfect.