If you fly long haul over once a month (which I guess a number of people on here do) with the same carrier you invariably get months when on the first trip you see every movie you want to out of the selection available,
I've had trips where I didn't want to watch any of the movies available. Normally I spend ten minutes constructing a playlist from the audio section and listening to that while trying to sleep. Generally I find sleep on long-haul to be more valuable than movies.