I am a TODO junky and have been doing since 1999. I used to have a small packet book then and used to write the tasks for the day, strike them once complete. Move the tasks not done to the next day.
I have used lot of tools since then via Online, the following list of apps/sites, may be more but I don’t remember.
Finally when Google introduced Inbox, it was a shock as I couldn’t understand how it can be used to have your email as Tasks. Snoozed, Inbox, Done labels were confusing. Once I figured it out there is no looking back. I am also fan of Zero Inbox.
Merging my email and then the tasks is an innovation and Google did the right think with Inbox. I am sure I would be sticking with it for a while unless some thing else comes up and disrupt it, as always 🙂