Does anyone have a rough census of what top websites use? I've had this same reaction, but more than once with PHP: I know now that at least Box, Wikipedia, and Facebook use PHP.
Pointing out that some large system uses a specific technology just means that it wasn't impossible to scale and use that technology. You can write a book with a quill pen; it doesn't necessarily make it the best tech to use in a modern publishing workflow. But if that's all you know how to use, don't let it stop you from writing.