Good question. Speaking for me (at the date of writing):
No - I don’t use it. As you already stated, I’m as well a “section-oriented” one - or in other words one-dimension designer. So the real strength of the two dimensions (horizontally and vertically) doesn’t fit into my current design scheme.
The CSS grid does have some ultra cool features such as the grid-gap (column-gap) but generally spoken, it reminds me too much on modern-superfluid-semantic table-design somehow.
But it’s perhaps just me.
Cheers
Thomas
Edit: Just dug another thread out I created some moons ago (with not much of activity) CSS Grid - Just a cent for your thoughts