I am always reminded of it when accidentally I go fullscreen mode and my flux turns off. It really hits you how bright the screen gets (and I am not using full filter, I like to keep colour distortion at bay).

Even if the blue light is a myth I will keep on using flux.

I agree. Even if blue light wouldn't interfere with sleep in any way, the glow of the screen in the evening feels so straining to eyes that just for this reason I like to use f.lux.