I believe most of Office's userbase doesn't use anything more complicated than excel's formulas and word's styles (perhaps some academyc writers use latex or fields)
It's surprisingly common. Even my wife who is a complete luddite has a couple of scripts for excel she copied off a web site to do a tax calculation.
Not bitter at all. Nope.
It's now a nice clean late-bound C# command line tool and powershell cmdlet.
These are all real problems I've had to work around.