I developed my own gmail app script to accommodate my personal workflow, where all tasks and task-related information, including Gmail inbox, are organized and scheduled in the same hierarchy.

Here is why I think it makes me extremely efficient

1. I can group and nest together Emails, to-do’s, files and links that are related to the same goal, my lists are now much shorter and manageable and I can focus on my goals instead switching between gmail, todo’s etc..

2. Since my gmail Inbox is fully integrated with my to-do list, I don't need to manually and tediously maintain and synchronize them.

3. Scheduling a goal with sub-emails and tasks hide them and bring them back when I need them.This further reduces my clutter and makes sure I will not forget anything.

4. I can organize my plans and thoughts as I organize and drag inbox Emails, To-Do’s and Ideas into their related tasks.

5. Since every email has a natural place in my task hierarchy, I can quickly empty my Gmail Inbox and deal with email when dealing with their related tasks.

What made it stick for me was processing my gmail inbox (which I must do), inside my todo list, which quickly created a habit.

BTW I tried to market the solution and gave up, either most people think different or I am just a bad marketer.