I tried Omni Focus (I was in the beta programme, and I had been using than Schoonover's Kinkless GTD before, from which Omni Focus derived) and didn't like it. After some time I discovered Org mode and this works for me.
I think the Org mode journal style just fits the way most people plan much better than the GTD ramified list approach. You have a file per project or maintenance domain and you jot down your priorities, interleaving tasks where they are relevant tasks. Then Org mode's tools put together the lists you need when you are getting through your tasks. There's no need to internalise a complex external model, a step that clearly many people fail at when they try to apply GTD.
More generally, I find that when I started using OSX, I used a lot of the Apple-esque programs but over the years I've mostly migrated back to software that runs on Linux. OSX has increasingly become a wacky UNIX with a nice GUI to me. The superbly integrated Parallels is the only non-bundled software on OSX that I would really hate to live without.
I think the Org mode journal style just fits the way most people plan much better than the GTD ramified list approach. You have a file per project or maintenance domain and you jot down your priorities, interleaving tasks where they are relevant tasks. Then Org mode's tools put together the lists you need when you are getting through your tasks. There's no need to internalise a complex external model, a step that clearly many people fail at when they try to apply GTD.
More generally, I find that when I started using OSX, I used a lot of the Apple-esque programs but over the years I've mostly migrated back to software that runs on Linux. OSX has increasingly become a wacky UNIX with a nice GUI to me. The superbly integrated Parallels is the only non-bundled software on OSX that I would really hate to live without.