Actually, most people are unaware of the bug. But almost everyone experiences it. Apps that stay in the task/multiswitcher are left there, in a "frozen state". With winterboard installed, except for 2-3 recent apps that were last open, all the other apps in this "frozen state" are immediately shutdown. User won't notice, and if they do, they'll just ignore it because it only takes 1-3 seconds to reopen/reboot the app.