Add lines across the center of the grid to help orientation in large node trees.
Demo
Based on feedback by @Jonathan Lampel (jonathanl), on which I agree it's handy to have a reference to where you are in the canvas.
A deeper root to the orientation problem is that the view stays the same while you change editors (Geometry Nodes to Shaders, for example). This can be very confusing, but it's a topic for another patch. Even with that fixed, a center indicator is good to have.
Previous Attempts
The previous attempt used a cross, but it's easy to lose it under a node or when too far away from the center:

