In other languages there might be multiple frameworks and multiple libs all of which might do none of just part of what you need and if you find a lib you might not find an integration into your framework and need to build that yourself.
Rails was so big and the community was/is cooperative enough that you usually get fewer libs that are more complete and more likely to fit you needs and come with rails integration.
No need to test 10 or more libs to find out all of them sort of suck and then do it yourself or chose the least sucky one and integrate it yourself. THAT is what maid Rails productive and at times frustrating (you often only deep dive the components once something goes wrong).
Long term it will be interesting to see how many companies run with setups that are Node.js heavy in comparison to not just Rails but also Python, PHP and even Java, .NET and Perl (yes old but not dead).
Perl was one of the early languages and I don’t think there will be as many projects in it as there are in PHP. Python has a good amount of stuff and they didn’t really have a time of heavy hype (like PHP, Ruby on Rails or Node.js enjoyed) and Java and .NET are going to be more heavily traditional corporate than the rest.
Would be nice if somebody knows a link or two to explore this a little bit better.