Inexperienced speakers are often afraid that they may be forgetting an important point of their talk or that they get stuck and can't remember how to continue. Which is one of the reasons why so many presentations have lots of text on their slides.
Cue cards would seem to provide a solution to this problem. They're handy when you get stuck and since you now have the text of your talk at hand (pun intended), you can use more visual slides and still make sure not to forget anything of importance.
