Same here, that's the only thing I use the IFE for. As my longhauls are virtually all overnight (South Africa - Europe), I tend to have a drink, eat and go to sleep (fortunately, 90% of my longhauls are in C ). In the morning when I wake up, I look at the flightmap to see where we are. Have not watched a movie for years, the screen is too small and the video quality too poor (on SA in any case) . (I' m not a big TV watcher at home either)
When I once did a CPT/FRA daytime flight, I tried to watch a movie. Awful experience, ended up reading and working on the laptop.

I do love my ipod plus noise cancelling headphones though!