I feel that this is something that would be fixed by writing your test suites first. If you think you have designed a tremendously clever API, but then the code that calls it is an absolute mess, then you have not designed a tremendously clever API.

General principles of restraint and not having to use every available language feature all the time apply here as everywhere - keep it simple, stupid. The only WTF I want when reading your code is, "I didn't realise there could be such a straightforward way to do it".