There's a document here, describing keyboard entry:
http://www.chem.mtu.edu/~tbco/cm416/EquationEditor_main.pdf
It's basically a markup language of sorts, and I'd use it if I were presently writing a lot of text with equations.
For better or worse, working in industry, my reports are free of equations! I've formed the hypothesis, that when managers and non-technical people see an equation, they assume the report is "incomplete," i.e., the equation needs to be turned into an actual result.
I've been to academic talks where, instead of typeset equations, the author just copies the source code from their MatLab file to a PowerPoint slide.
And I suppose a useful thing is that if you do misspell one of the keywords, it just sits there until you correct it, as a reminder of what you were trying to write.
And in Powerpoint the formulas have constantly different sizes and are distorted. I don't like beamer (a latex package), but it the only viable slide show software for me.