You seem to be making assumption dynamic languages are more concise than statically typed ones. In modern statically typed languages with type inference it is no longer true. E.g. I find Scala more concise and expressive than Python.

As for IDE usage - programmers of dynamic languages keep away from IDEs, because traditionally IDEs failed to provide the same level of support as they did for static languages. E.g. autocomplete, error highlighting and refactoring were absent or at best not reliable. So if the value add over plain editors was so low, then why bother?

Having said that, I do see more and more people using IDEs with dynamic languages these days. Probably because the good ones have some limited autocomplete and error checking for dynamic languages now (e.g. PyCharm, PhpStorm).