Laziness matters less in a FP language because if we consider non-termination an effect (impure), all pure functions should behave exactly the same regardless of whether they're "lazy" or not (plus in FP sameness is defined as same values, due to "value-semantics" - unlike OO where every object has a unique identity, different from all others) because in the absence of side-effects order of evaluation is not important.

Of course reality is different, and laziness has very visible and important effects when Haskell programs run on today's computers :)