You hate Things, you can’t stand The Hit List, you don’t want to use a web based application. You want minimalism in your GTD app. Or maybe, you just want a simple to-do list application, because that’s how you get things done.
TaskMate by Ryan Conway is a straightforward Mac app that lets you enter tasks, delete them and mark them as complete. Nothing more, just checkboxes.
When Apple will bundle a Tasks.app with Mac OS X I’m sure it will be something like this.
Also, it’s free.