I get that sense with some of the writers, others not so much. George Clayton Johnson, for example, had some interesting ideas that Roddenberry's re-write of 'The Man Trap' gutted.
Yeah it sounds like Johnson's version would have been a bit more interesting. Although in general I find myself disagreeing with Black and some of the others who criticized Roddenberry's writing.
Sure he might have been a bit sex-obsessed, and could be a bit ham-handed with the dialogue at times, but he also came up with a lot of really beautiful and eloquent dialogue at times too. Like Kirk's line about wishing he was "on a long sea voyage", or McCoy's speech to Kirk about all the millions of galaxies and Earth-type planets, ending with "Don't destroy the one named Kirk."