I come from EAGLE where filled planes are drawn on a different display layer from the traces that end up on the same PCB layer. I want this behavior in KiCad, too.
This is helpful because it lets you inspect the plane separately from the traces that cut into it. You can see problems this way as they form, rather than after they've become a real mess. A common situation is that you're using a PCB layer primarily for a ground/power plane but are also sneaking some signal traces through it where they don't fit on other layers. You can end up chewing the power/ground plane into lace this way. Inspecting the state of the plane occasionally separately from the traces can warn you about impending "lace disintegration" well before it happens.
The current mechanism for hiding the filled zones addresses the opposite problem: you want to see the traces and *not* the zones. I want the ability to turn off, say, the top copper layer traces without also turning off the filled zones on the top copper layer.
This is possible in 5.0, you can now hide tracks and vias.
Only free text cannot be hidden.
I guess this bug can be closed now.