I think from what I have heard at least people use Node.js because its well designed and because they can use a language many people are familiar with Javascript. Personally I have little interest in web development . I cant say I find the video funny since it seems to draw a caricature over people who prefer one technology over another. Afterall you could as well make a video about Pharo vs other languages and IDEs and debate that the boosted productivity is not much and in cases much slower than using other languages.
The answer to those matters is never simple anyway.
And In the end what it counts is the end results, all those tools are just means to an end. So try to convince people about which is best, is kinda pointless as it is this video. We can all be friendly make our own choices without offending other people.��