Things 3 is the best to-do app you can use without a mouse. My favorite keyboard shortcut is Ctrl + Space, which lets me capture to-dos even during intense meetings.
Absolutely love Things, and utilize it as my go-to for managing all my tasks personally and professionally. Only issue I have revolve around collaboration features. Would love to fully merge all task management into Things, but cannot do this with collaboration features (sharing, commenting, attachments, etc.)
Pretty. Lovely. Consistent. Also, trapping, unsustainable, lacking and über-slow to evolve. I've had a love-hate relationship with Things since their very first version, up until their last release. I got tired of waiting and compromising with other apps to do what I need. Leaving Things3 was a real nightmare, as I had so much in there. CC chases highlights in the AppStore to exist, and has little to no interest in user feedback. A very expensive one-thing only tool, at times where everyone in the room is smarter. If only others could copy it's perfect parsing add task extension.. I am far and well away from it.