This question was posed to me recently: What am I watching?
I'll admit. I'm one who uses a monitor. I feel in this day and age of high page count and long work hours that anything that can help me go out quicker and less takes - I'm all for it. One can't always get close to the camera when there's two (or more) camera crammed against each other and assistants all over so, one feel a bit removed. The monitor really helps and I feel that I'm more "synergistic" with the operator.
Having the right tool for the job is more than ever important these days. One can't always get by with a little 3" Casio wireless anymore. It's a big decision whether to spend big bucks on something that you may not even get the kit rental on. I purchased last year a Marshall 7" HD monitor. Not top of the line, as I'm not pulling focus from it, but something that has reasonable brightness to see in the outdoors (with the help of a hood).
Are you using a monitor? And if so, what are you using?