Almost all Todo apps have the problem of showing you stuff that you are incapable of just seeing things you _can accomplish right now_. I think people underestimate the amount of pain that comes from, over and over again, looking at a list of things you can't do anything about at a moment X. The only TODO app that I've found get this at least 95% right is Omnifocus with its billions of settings. Though there's still…
So one heuristic I do is is try to start my day setting my “intentions” — identifying a handful of things on the list I would be pleased to have finished by days end even if absolutely nothing else on the list is touched.