To go boldly just doesn’t sound as good.
(1) those who neither know nor care what a split infinitive is;
(2) those who do not know, but care very much;
(3) those who know and condemn;
(4) those who know and approve; and
(5) those who know and distinguish.
Those who neither know nor care are the vast majority and are a happy folk, to be envied by most of the minority classes. - H. W. Fowler, Modern English Usage (1926)