When & how do you choose the messaging option on your cell phone rather than placing an actual call?

Sending a message can be quicker and more practical than making a call when the message is short and to the point, especially if information such as an address, a meeting time, or a phone number must be communicated. However, I get irritated when people hold entire conversations via message rather than just calling.

When do your prefer messaging to calling, and why? What are your feelings about frequent messaging as opposed to phone calls or emails?