> But I guess an ordinary language could have such programs, as well.
Yes. In fact a very high percentage of all software written falls into that category. The challenge is to write clear maintainable code in any language. The language can help or hinder the process but it cannot solve the problem (aka there is no silver bullet). Language terseness compounds the problem mostly by extending the learning curve beyond economic practicality.
PS: if you want a really tiny language, use FORTH. Its trivial to write totally incomprehensible programs in it. Its compiler, os, and executing environment can live in less than half of a 1K 8 bit computer. Multiple programs can live in the rest. Its a brilliant concept that totally solves the wrong problem.