Split it by mood, not one giant list
One list with everything on it is too much to choose from. Split it by the kind of night: date night, family night, the ones you only watch on your own, the box sets you are saving for a long weekend. When the night comes, you only look at one short list.
Keep each list short enough to choose from
If you can't take in a list at a glance, it has stopped helping. When one gets too long, split it again.
Add it the moment you hear about it
A friend's recommendation, a trailer, a review you read on the train. If it doesn't go on the list straight away, it is gone by the weekend.
Keep "not out yet" separate
Something you are excited about that isn't out yet only gets in the way of choosing tonight. Keep those on a separate list, and move them over once they are out.
Clear it out now and then
Every so often, go through and take off anything you have watched or gone off. A short list of things you still genuinely want to see beats a long one.
Share it with the people you watch with
A list only you can see only helps you. If you watch with a partner or friends, build it together so everyone's picks are on it.
Borrow a list to get started
Starting from nothing is the hardest part. Take a ready-made list, like Rainy Sunday, Family Night or Crowd Pleasers, and make it your own.