> You have to go look up three functions every time you read a block of code.

When you write small, single-purpose functions, you can make them fairly self-documenting with the name alone. If you have to look up a one-line function, it probably doesn't have a very clear function or name.

> Worse, people start writing the same functions over and over again.

That one I've definitely run into.

> There's probably a bigger picture problem and fix in that kind of situation, but it is something I think about.

Mechanisms to search functions by type ("find me a function that takes an X and returns a Y") help quite a bit.