All too often, our to-do lists fail us. They're too long and unreasonable. You don't have to completely ditch the to-do list though; you can actually feel more productive if you implement a priority rule for your tasks, such as the 1-3-5 rule.
On any given day, plan to accomplish one big thing, three medium things and five small things. This limits your to-do list to nine items, and keeps the hundreds of other things you might have in a to-do list app from haunting you.
This is just a framework, similar to the 3 + 2 rule we've mentioned before (three big things and two small things). It has the same benefits of focusing you on your priority projects, and the 1-3-5 rule to be a little more doable for you, depending on your needs. (Of course, both of these are flexible, so you could make up your own 1-2-3 rule or whatever works for you).
The Daily Muse even has a handy downloadable template for planning your tasks day-to-day with this system.
A Better To-Do List: The 1-3-5 Rule [The Daily Muse]