Has the author heard of gj and gk?
Op's plugin is like transposing the buffer like a matrix, and then using normal word motions on the line that was a column.
For me there's a tension between a growing number of very specific features and my ability to remember them all. These days I opt for minimal vim addons, as there's usually a good enough way to get something done by default.
But for people who need exactly this sort of thing, this thing is exactly the sort of thing they'll like.