Everyone except the Nurse and the servants.
Generally (but not always!) Shakespeare's characters who spoke in blank verse are the lower-status characters. Think of which characters are not as important, then compare that to some of their speech in Romeo and Juliet.
romeo
Sampson, a servant of the house of Capulet.
Romeo speaks in scenes 1 and 2 of Act 1 but we don't hear Juliet until scene 3.
They met during the feast at the Capulet's (Juliet's family) home, Romeo fell in love with her. He hid behind the curtain and grabbed her by her arm and that's when they first spoke to each other.
Romeo
In Romeo and Juliet, there are two ways darness influence the scene: 1) When Juliet was in the garden during her soliloquy, (Saying her thoughts out loud) she didn't see that Romeo was there becaue of the dark night. 2) Whe Romeo showed himself, and spoke with Juliet in the garden, he was not caught by the gaurds because they couldn't clearly see him. It was too dark for them to notice. Hope this helped! ~R
They met during the feast at the Capulet's (Juliet's family) home, Romeo fell in love with her. He hid behind the curtain and grabbed her by her arm and that's when they first spoke to each other.
Ummm.... did you not notice that most of the character's spoke in rhyme, or rhymed their response to those who spoke before them? Shakespear's characters spoke in rhyme throughout the majority of all of his plays. This was shakespear's way of writing. Take Romeo and Juliet, e.g. Romeo: "If I profane with my unworthiest handThis holy shrine, the gentle sin is this: My lips, two blushing pilgrims, ready standTo smooth that rough touch with a tender kiss." Juliet: "Good pilgrim, you do wrong your hand too much, Which mannerly devotion shows in this; For saints have hands that pilgrims' hands do touch, And palm to palm is holy palmers' kiss." This style portrays throughout the rest of the play of Macbeth as well, and is not only pertinent to the Witches.
There was an almighty huge fight between the Capulets' servants (who start it) and the Montagues' servants which ends up involving everyone including Capulet and Montague themselves. The Prince stops the fight and says that if there is any more of this kind of behaviour, whoever is in it will die. Lady Montague wants to know where Romeo is, and Benvolio explains what is up with Romeo.
That scene is in Act 3 scene 5. Right after the fight between Mercutio, Tybalt and Romeo. Tybalt kills Mercutio, then to avenge his death, Romeo slays Tybalt. The consequence is that Romeo is banished from Verona. If he is seen he will be killed. So they meet up in the dark, and he hides in the shadows. They keep their relationship a secret and hiding things is easier in the night.
It is simply the way that people spoke back then, and you can see that we no longer speak with that dialect. Also, it is the genre. Many people back then love the lust, romance, tragedy and intense drama that the play had - much like today.