1. Every active project gets ONE next action. I manage my projects, not my tasks. So when I determine what action I will take next, I pick the project that gets to move forward (constrained by the context I am in).
2. If a project is not active, meaning I want to do it but I just do not have the time or energy to start it, it lives on Someday/Maybe. Like Oogiem said, emphasize Someday not Maybe. If it still bothers you, rename it to a word that feels better for you like Not Now, or Later. As long as it works for you.
3. Weekly review. This is what pulls the lists together so that you can put it on Someday, Later, Not Now, whatever and not feel that you will ignore it. Once a week so you can feel safe putting things on that list, but not every day so that your eyes glaze over.