Tbh it's this attitude that's held Android back for some people. Some times you have to do this because it looks nice, even if it might slow a process or serve no real purpose. Android designers seem to be realising this now.
Having a CRT off animation for switching the screen off is hardly time wasting or slowing down a process, it's the one time when using your phone that you can afford to play around with animations. It's akin to complaining about a boot up logo or shutting down animation.
If anything android has been trying to save time with minimum inputs. From the lock screen you can; swype to use the camera, pull down notifications and act on them, control media, and from 4.2 swype to widget screens and use the two finger notification pull down menu.
Then there's the dedicated multi-tasking button, quick access LAB thumb controls for the browser which are also coming to the new camera app in 4.2.