I've always understood that splitting infinitives should be avoided; e.g., instead of
To boldly go where no man has gone before.
To go boldly where no man has gone before.
With that in mind, I recently saw someone post the following comment on Facebook:
This is horribly written.
It struck me that a phrasing that sounds more natural to my ear is
This is written horribly.
In trying to determine why I prefer the latter, I realized that the adverb horribly splits the conjugated verb is written. Is this just personal preference, or is this "split conjugation" basically the equivalent of a split infinitive?