Mathematica does have a function "TraditionalForm[]" but this is terrible. There seem to be little or no formatting options and it chooses odd things like displaying "[itex]x[/itex]" in a different font when there is a [itex]\Delta[/itex] before it. It is also significantly harder to input a formula into this function than it is to type LaTeX.

I hope that I am just tired and missing something obvious, but multiple searches have not helped me.