You can delete suspended tabs at any time, and they will remain there until they are deleted. So, if you have tabs suspended and you go away for a week, they will still be there when you return. This could be useful when you have something you want to refer to later, but that you do not want to bookmark.
If you are using Doctopus and you have many students' work opened, you can see the names of the open documents to know which tab belongs to which student's work. It can certainly help eliminate some confusion while you are trying to work on feedback.
And, if you are like me, you have lots of tabs open all of the time! This can help you manage them a bit.
To get this extension in the Chrome Store, go to Too Many Tabs.