I've tried numerous to-do apps, some that never even go out of beta. But I kept returning to Things, mostly for the user experience. It's unobtrusive and fast to use, and it looks fantastic, which is more important than I first realized. To become more organized, my app of …
It's great for everyday use, whether you adhere to the GTD regimen fully or just need a way to quickly capture and sort your tasks. However, it may be less suited if you're looking for a task manager that lets you collaborate with others or if you want to visualize your tasks in other ways, like a Gantt chart.
The interface of Things was good 10 years ago, and has been refined ever since. It's lightweight, while still being readable and showing just the information you need to see. Also, something I haven't seen in any other (of my) app(s) is the keyboard shortcut/launcher, where you start typing a letter, and a dropdown menu lets you quickly jump to a view.
I've tried numerous to-do apps, some that never even go out of beta. But I kept returning to Things, mostly for the user experience. It's unobtrusive and fast to use, and it looks fantastic, which is more important than I first realized. To become more organized, my app of choice needs to look organized. Also, many competing solutions are trying to force you into one way of using their app, while Things feels more open to letting you define your way of working with task management.