[8ren]

Not exactly: many languages are open; my focus was on the ease/speed tradeoff.

Haskell and the ml family only have ease-of-use for people who think higher order predicate calculi have ease-of-use - some of whom will vigorously argue that everyone should find them easy-to-use.

(I don't know enough scala to form a judgment, but I haven't heard it being touted as primarily having ease-of-use, in contrast to Python and Ruby.)