@h A classic example is trying to write an object-oriented database system in PHP or C#. You build a database schema in SQL. Then you painfully and manually wrap your SQL schema as a tree of object classes. Then you painfully and manually write XML configuration files to glue it all together.
Or you use some proprietary half-specified tool that promises to generate all the boilerplate for you.
All this boilerplate *shouldn't exist*. It means our languages are modelling the wrong thing.