I have even seen some solutions to the long division problem using Tikz. There are several that I would like to see added, including Tikz or PGFPlots. Some people would definitely use them, but most of the people using equation editors with Canvas would not. Neither longdiv nor polynom are mainstream packages, though. I have only played with that one, but I have definitely use the polynom package that does synthetic division. It does the full division problem, not just the formatting so that it looks nice, although that is part of it as well.
It's not even a long macro, just 42 lines with comments. This one is available as just the basic macro.
In other words, he normally has full package documentation. Longdiv was written in 1994 and really isn't one of his major productions. The longdiv package is written by Donald Arseneau, whose name I see all over the place on the TeX exchange for accomplishing magical things and who has written many packages. Division has always been problematic in LaTeX, as evidenced by the hacks required to get it look right in the TeX exchange you referred to.
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