Giving planes thickness in real-time display I've got a bunch of planes that are perfectly lined up with the coordinate space, so I can't see them when I go to either front, side, or top view. Is it possible to give planes some thickness for the real-time display, just so I don't lose track of them when I'm editing other meshes?

I can imagine giving them all a thickness modifier that is disabled for rendering, but that seems like a big pain in the neck.
I only see your problem when you are in orthographic view and your plane overlaps with one axis line. You could go into Properties -> Object -> Display panel and enable Axis or Wire.