oceandune's first poem reintroduced me to the breadth of intentional prosey poemish writings in the form of Baudelaire's writing. And to be honest, there are sections of Robert Penn Warren's All The King's Men that feel like prose poem paragraphs, one after the other. While sounding like prose, his writing can draw deeply from the poet's toolbox.
There's no bright line between prose and poetry. The more a piece of writing utilizes symbolism, metaphor, simile, allegory, cadence, meter, rhythm, rhyme, assonance, the more its going to look like a poem. There are the visual features of a poem as well, that prose generally makes no attempt to use.