Thanks to Morbus, I have finally found a time management system that looks like it could work for me: Structured Procrastination.
[...] the procrastinator can be motivated to do difficult, timely and important tasks, as long as these tasks are a way of not doing something more important. Structured procrastination means shaping the structure of the tasks one has to do in a way that exploits this fact. The list of tasks one has in mind will be ordered by importance. Tasks that seem most urgent and important are on top. But there are also worthwhile tasks to perform lower down on the list. Doing these tasks becomes a way of not doing the things higher up on the list. With this sort of appropriate task structure, the procrastinator becomes a useful citizen. Indeed, the procrastinator can even acquire, as I have, a reputation for getting a lot done.