You must not have used a modern IDE. IDEs such as IntelliJ can fold a lot of boilerplate [1]. Besides that, modern Java IDEs offer so much functionality for refactoring, code generation, etc., that it's often hard to be more productive in other languages (I have used C++, Python and Haskell for years, but I am more productive in Java after using it for work the last 1.5 years).
Scala simply doesn't have the same level of support in IDEs as Java does.
[1] http://confluence.jetbrains.com/display/IntelliJIDEA/Folding