I have my TV, Freeview box, music centre etc, on a multi-strip plugged into a non-switched socket. So I have now introduced a switched socket into the line so they can all be switched off with one switch.
In my office I have a lot of computer equipment, plus TV and freeview and all are controlled by master switches. I actually have 17 sockets in the office. You need alll that when you have a computer, a text inkjet printer, an inkjet photo printer, a laser colour printer, a flatbed scanner, a film scanner, various external drives, DECT phones etc. Needless to say they are not all in use all the time.
The only advantage of standby or hibernation is that it takes less time to be up and running than starting up from cold. With LCD displays there is no point in screen savers, it would be better to just switch off the display.