So I theorize too much and it doesn't make much sense to you. I'm saying, forget about the thing that the golden ratio is everywhere.
Recently I've looked at a couple of real, explicit golden ratio examples:
- People usually make the cursor blink time 0.5visible-0.5invisible. Try 0.618visible-0.382invisible. (Of course it isn't good if the cursor blinks very slowly, like every second or so.)
- Try the 0.618 opacity for HUDs.
I'd put a warning: do not abuse the ratio.
If you want the 3D graphics to dominate (in parts of the HUD that are just decorations), use 0.382, and if you want the HUD pictures to dominate, use 0.618 opacity. But just because that 0.618 looks good, doesn't mean it should be used if you want to clearly see the HUD or the data on it (like a small crosshair).
Another example, uhm, movement speeds. Making it so that you run forward with 1.0 speed, to the right and left with 0.809, and backwards with 0.618 may give the user a feeling that something is right here, but for gameplay reasons, this cannot be used. 1.618 sprint speed would also be rediculous.