There's a whole hipster movement going on right now around the idea of omitting semicolons from JavaScript code. I believe CoffeeScript is the culprit.
Kind of funny that you say this, since CoffeeScript inserts semicolons.
The lack of semicolons is the one major thing in the Github style guide that I think is stupid. It seems silly to avoid using semicolons in Javascript because it actually takes a little bit more effort than just using them.
On my team we've decided to use semi-colons in JavaScript for this exact reason: It would actually take more effort to stop using them as our other major language is PHP. More effort for no benefit is pointless.
Personally, I agree with Crockford -- it's dumb.