By "information dense," I meant in contrast to what is typical in modern GUIs: generous borders and margins between interface elements, large buttons, etc. My experience both using and writing TUIs is that, because of the extreme limitations of your tools w/r/t styling and layout, more of the screen real estate tends to be devoted to displaying data, and on whole I prefer that.

YMMV, of course, I'm just sharing my own experience and perspective.