I was pointing out the View Range help documentation earlier and noticed that the plan view seems to have Thin Lines on, no particular difference in the lineweights depicted. At the very least it is a bit anemic looking. I think it would be a little more helpful to be more obvious which lines are affected by the Cut Plane by showing the Cut lineweight, like for the walls.
Fwiw, I think View Depth should be moved above the Primary Range when the View Range dialog is opened for Ceiling Plan Views...and maybe called View Upth? :)