If this were the case we would not see companies like Google and Facebook spending so much time using it. These guys know scalable and almost everything you use on both of those sites rely on the fact that it is scalable, modular and extensible.
No way! You can do so much with it that boring should never enter your mind. Even if you think you have mastered the language, if you explore a bit more you will find the weird stuff left over to maintain backwards compatibility. Check out wtfjs.com for more.