Why is blank verse such a promising medium for dialogue? Probably it is because the form conveys a slight height­ening to the material through its recurrent sound-patterns, holding our attention without distracting us by its artifice. Our attention thus engaged, we are reminded of the collab­or­at­ively creative nature of conver­sation, which is human drama in itself… Even if the language (of blank verse) is collo­quial, the meter formalizes it and, in the way of many esthetic devices, entices us even as it distances us from the dialogue we are overhearing. We are carried by the rhythms as the speakers are. Because each speaker sustains similar rhythms, we feel the intensity of their connection to each other: they are in some sense on the same wavelength, even if what they are exchanging is mottled with misun­der­standings. Their speech is the way they reveal themselves, and blank verse, in its unobtrusive though stylized way, draws our attention to disclosures of character.

Blank verse: a guide to its history and use by Robert B. Shaw, page 7