If you exit an application accidentally, you can get back using the task switcher, like you say.
The other situation you describe (you have a set of applications on a screen far away from the first home screen, and want to launch many of them at the same time) seems uncommon. It's typically bad to have a UI that makes the common case worse in order to make an uncommon case better.
The other situation you describe (you have a set of applications on a screen far away from the first home screen, and want to launch many of them at the same time) seems uncommon. It's typically bad to have a UI that makes the common case worse in order to make an uncommon case better.