Org mode is amazing as a TODO list. As you've noticed, text files are really convenient for a variety of reasons. If you like emacs (I've been using evil mode

Org mode is amazing as a TODO list. As you've noticed, text files are really convenient for a variety of reasons. If you like emacs (I've been using evil mode recently), then it's pretty much the ideal user interface for outlining tasks and keeping track of them. Prioritisation is simply a matter of cut and paste. The visibility features of org mode make it very easy to keep track of a lot of items. It also has support for setting deadlines, time tracking and reporting. It's worth spending an afternoon playing with it. There are a lot of features.