Eclipse (and other modern IDEs) is the killer feature that most other languages don't have. (With the notable exception of C# and Visual Studio as the counterparts to Java / Eclipse.)

A large code base written in a language that does not have tooling to do automatic refactoring cannot be maintained for as long a time. Gets scrapped sooner and rewritten. Especially in dynamic languages. A dynamic language may be much faster to prototype and get your initial code base written. But just try maintaining it for ten years. Twenty. Etc.