While I disagree with your initial statement this part is true. Moonlight without clouds is actually quite bright and you can see quite visibly and is no where near as dark as it is in game. That said if its raining or your in the woods it's quite literally that dark and you would be stumbling into tree after tree. I'm not sure if something like this can be scripted into the game, where the moon does have an effect and you can see shadows and such in game but only in clear open spaces. Wandering around in the woods or if its raining you will require some form of light source to see. This is only an idea since I agree with the OP, no one uses night servers because its to dark and using a flash-light pretty much spells your demise.