i don't hear it like that, as an evocation of hippness etc. 'fuck' is an intensive in certain usages like those above. i.e. it adds an emotional charge to adjacent lumps of meaning. colloquial speech uses these all the time and it's not confined to certain social classes, types of english, or age groups. the writer's use of this emotional energy of the colloquial strikes me as skillful and therefore 'grown-up'.