The App Switcher has changed a plethora of times over the years with each major iteration of iOS, but most would agree that even the latest interface leaves a lot to be desired.
One of the most common complaints about the current App Switcher setup is how it seemingly wastes so much canvas space that could otherwise be used for a more intuitive interface. That said, iOS developer relative just released a new free jailbreak tweak called NewGridSwitcher that aims to help resolve this problem.