John Carmack, the famous Id Software programmer, tried it out for a few thousand lines of space rocket code, and he liked it. He argues why giant huge functions can be good for maintainability:

http://number-none.com/blow/john_carmack_on_inlined_code.htm...

Previous HN discussions about that:

https://news.ycombinator.com/item?id=12120752

https://news.ycombinator.com/item?id=8374345

https://news.ycombinator.com/item?id=18959636