Thanks Joey P, I've looked at my owners manual and there is a square yellow box in the operation section telling you that leaving the key in the ON position can damage the ignition. Wow, you think that would be on the first page.
I've researched that Idea a little further, in my Camry car repair manual and it seems there are a lot of things that get power when in the ON position. Fuel regulator, ECM (ECU), ignition and other sensors.
I just hope after all these years that I have not damaged anything expensive.