If you are searching task to-do app for using your Nexus 7 tablet as an aid to productivity, Astrid Task/To-do List really can help you cut down on the procrastination. The app has a rich tablet interface and easy to use on HD displays. It allows you to get GPS/Location based reminders, have subtasks, lists, and widgets, and automatic sync with Google Tasks.
I have been using Astrid Task Manager on my tablet for a long time. Now it becomes my personal assistant. I always have only about 30 tasks, but it seems to be slowing down and causes the device to be unusable. It also doesn't support multiple google account at a time and I have to sync manually. Totally, it's excellent app that integrates well with Google tasks.