I've sailed through the Strait of Hormuz a couple of times. There are defined shipping lanes that deep seas stay in. Unlike, let's say, the Strait of Malacca, you don't see much in the way of small coastal traffic in the shipping lanes themselves as small vessels will draw the attention of the various Naval Task Forces operating in the area, who will probably board them, under the auspices of maritime security.
The Iranian Revolutionary Guard Corps Navy patrols in small FIACs though. There are a couple of spots where they make their presence known and they have ongoing disputes with their neighbors.