Tiny, tiny Houdini tip: for 0.00001% of users, this may help you keep things feeling tidy

The node editor snaps nodes to an invisible grid, by default, to help you keep things tidy.

But enabling the grid lines (Node editor -> Tools -> Show Grid / Grid Lines makes the grid show up. For some reason it makes the node editor feel much tidier to me, and much more ordered. YMMV.