There are a lot of actors who will watch the monitors. They'll do a scene, and then the director will look back to see if he got whatever he wanted. I just find it odd to sit there and watch yourself. But if you can be objective, I can see how it's really useful as a tool, especially if you're doing something physical.
The limits of sensory evolution in fish are defined very largely by their habitat. Water is physically supportive, carries some kinds of odour well, and is kind to sound - letting it travel several times faster than air will allow, but it inhibits other more personal kinds of communication.