The reason is that the grammar is so developed that the word order is essentially arbitrary, and that, together with other grammatical features, gives rise to a method I have not seen so fully realized in any other language:
It allows you to express the content in such a way that the way you express it matches the content.
For example, consider the verses:
Daedalus interea Creten longumque perosus
exilium tactusque loci natalis amore
Here, exilium (= "exile") logically belongs to the first verse. The
flexible word order has allowed the author to arrange it so that this
word appears in isolation (i.e., "in exile") from the verse it belongs to, while still fitting the metre
(hexameter), thus matching what is being described with the form that
is used to describe it. The suffix "-que" that can be attached to Latin words to mean "and" makes "longumque" also quite long as a word, stressing how long the exile is.Especially in the Metamorphoses, this strategy is extremely common and applied masterfully: If something is being described that is hard to do, then the sentence is structured in such a way that it is comparatively hard to understand, by using an unusual word order etc. If things are far apart, the words are themselves far apart etc. For quick things, words are omitted that cannot be omitted in other languages etc.