I was almost one of them. I think the way people manage tasks and external state is so situationally, personally and contextually dependent that most todo list

I was almost one of them. I think the way people manage tasks and external state is so situationally, personally and contextually dependent that most todo list software gets to 60% of people's ideal workflow and that just isn't enough to work long term. I went back to a hardback notebook for a while and had quite a bit of success - the UX of pen and paper is really hard to beat, and you can implement whatever processes work on a page. That's started failing to scale, so I've started to look at software again. I've been trialing Amazing Marvin for a few weeks now, and I'm pretty happy with it. Lots of very different features that can be individually turned on or off to customise your workflow. I'll very likely convert to a paid user soon.