From the mod's page ( https://www.nexusmod...&preview=&pUp=1 ):
"This mod makes the first-person idle animation for greatswords less static by using the same animation as the warhammers and two-handed axes.
You can see it in action in the "videos" section."
Holding a two-handed sword is unrealistically static in the vanilla game. If you're holding a big sword in your hands, you're gonna be swaying it a little bit rather than holding it perfectly still. This mod provides a clever fix to this annoying problem.
This video shows it beautifully
Anyway, thought I would post this because this mod is underappreciated IMO.