A few ideas not explicitely mentioned yet:
- repetitive tasks, e.g. the function reads a database table with 190 columns and has to output them as a flat file (assuming that columns need to be treated individually, so a simple loop over all columns won't do). Of course you could create 19 functions, each outputting 10 columns, but that wouldn't make the program any better.
- complicated, verbose APIs, like Oracle's OCI. When seemingly simple actions require large amounts of code, it's hard to break it down into small functions that make any sense.
