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I haven't written any ruby, but I've seen very short methods used in Erlang and it can be useful. If you write one or two line methods, they're mostly to help name a concept and make the place they're called look more sensible.

Organizing all those small functions can be a challenge, though. Which is why I don't tend to have functions quite that small. But a lot of 10ish line functions tends to work ok. But then, Erlang doesn't have loops, and I don't like anonymous functions (unless they're so short and simple I don't expect to find them in a stack trace), so that tends to make things short by necessity.