You are asking for a hotkey, how can you say that you don't want to remember it.
Just assign a hotkey to the tab where all your tasks are, remember this only one because it is you question.
On the other hand, you have a interesting feature : double click on a task in a todo view, and it will directly bring you to this task in the "all taks" tab.
And also, if you press Alt+1 (not the num keyboard) brings you back to the list of tasks if you are in a panel field.