As this tutorial has shown, the DLTK provides myriad features for creating development environments for dynamic languages. Creating these environments doesn't require a lot of code, but you have to know exactly what you're doing. To configure text presentation, you must understand how the editor, viewer, and document interact as well as the rudiments of rule-based partitioning and scanning. To enable user preferences, you have to grasp the strange class hierarchy of Eclipse preference pages and DLTK configuration blocks. To enable launching of dynamic-language projects, you have to deal with threads, streams, and the protocol methods needed to communicate between the console and script interpreter.
The DLTK learning curve is steep and continues upward for a significant distance. But if you need to build a full-featured IDE for your customized script language, you'll find no better toolset. In addition to the material presented in this tutorial, DLTK provides many sample IDEs for languages like PHP and Tcl.