Exactly, when comparing the size after gzip compression, minifcation itself is often not worth the hassle. To get any serious benefit out of Closure Compiler y

Exactly, when comparing the size after gzip compression, minifcation itself is often not worth the hassle. To get any serious benefit out of Closure Compiler you have to annotate your source code, not use certain conventions, and generally worry about things breaking. That's probably just fine when you are transpiling (i.e. Google Web Toolkit) but its a PITA for everyone else.