Your tools should always be available to you when you want to use them for adding or completing tasks; it should be as easy and fun to use as possible for a tool like this; and it should support a system that you trust with your tasks and projects, that way you’ll be predisposed to continue using it without weighing the other options every other week. - Shawn Blanc
Last year I was crashing under a truckload of work and I had no system to organise or structure any of it. Tasks kept appearing on my agenda, and I had the constant feeling that I had to to everything at once and couldn't accomplish anything.
While being home sick (posibly from crashing under that pressure), I read Getting Things Done, and once I was getting better, I wrote down every task that was floating in my head in a notebook. Pages upon pages of items, todo's and ideas.
At the end of that week I purchased OmniFocus, dumped all data in the app and haven't looked back since then.
OmniFocus, just like 1Password and Evernote, has become one of those apps I couldn't live without, and that I trust in such a way that they're basically the only please their content lives. No backup, no alternative.
Tasks in OmniFocus, Notes in Evernote, Passwords in 1Password.
When OmniFocus first launched their beta program, I was a tiny bit frustrated. I depend on the app to do my job. And just like I'm annoyed when a collegue has sit in my chair and changed the height of the seat, I felt a bit troubled, because something had changed.
Luckily, the beta's kept improving, and I saw many changes in the beta's that fixed issues I had with the beta; Weeks starting on sunday instead of monday: fixed. Too much whitespace: fixed.
OmniFocus 2 does what OmniFocus 1 did: manage your tasks for you, so that the only thing that's left is just the work.