Plenty of such project-specific microDSLs can be seen in Lisp world. They do a great job at reducing the boilerplate one would otherwise have to write, and they're relatively easy to inspect, if you need to know what's being done underneath.
Right, but that hinges on the definition of a DSL. It's not a complete language for solving a domain specific need; it's just a set of abstractions intended to reduce boilerplate. To me that's not that different than, say, a library in any programming language; it's a set of nouns and verbs to make certain problems easier, but it still requires the full knowledge of the underlying language to make useful.
