I've heard that the reason it feels so good when your eyes are closed is that it frees up a large percentage of the processing power in your brain. It takes a good deal of your brains' resources to process visual information suppoesdly. When you free up all those extra resources, all of a sudden, you have more brainpower (and we can all use as much as we get!) to allocate to playing your instrument. However, missing cues is a major embarrasment and looks so ameteur, plus I believe that the audience much prefers it if they can see your eyes open, like you're present and accounted for not off in LaLaLand, so I try my best to keep the eyes open as much as I can. During any drum solo's is when I give myself permission to close them so I can get the benefit of more brain power, because Lord knows I need as much help as I can get during solos. But otherwise they're open as much as possible.