I bind those commands to "shift-j" and "shift-k" and heavily abuse them.

It's not pretty, one could argue that the mouse is more efficient for such movements, but for me it's faster in practice than moving my hand to the mouse/trackpad, or than looking up a line number (either absolute or relative) and then typing it. And it has no mental burden.

I usually go with { and } for those to jump between paragraphs, as that is usually a sensible distance of movement. But your approach is also an interesting addition as it's more consistent.

I use them heavily. Also, check out ]] [[ and ]m (jump to end of function).