I like to err on the side of caution.  My equipment rack has a Furman rack mount strip that I power the rack equipment from.  The Furman is powered by a UPS system.  Even with that, I power on each device in the rack individually.  

I also turn of any Phantom Power when I've finished using any mikes or DI that used it. Studio and Live. 
As well as I often turn down any mixer faders not in use etc. I really don't wish to blow up my NSM 10's just yet. 
 
Jeff is this what your using, I have 2 of them I use for things I don't use much.
 

Do you turn off the plugged MCU, extenders, and other devices before you switch off the power strip? If not, you'd better not do like that. but devices can be gradually damaged if you control devices only the power strip switch for a long time. How much it can damage depends on the quality of your device, including the quality of power strip. If you want to make it easy to control devices, you can use remote controller. The best way to protect your devices is to turn off each device first.  then switch off the power strip. The appliance switches are commonly built-in protection board that can guard against instantaneous high current like a surge protector. if you forget to switch off your surge protector, your devices can also save themselves when there is power failure. You can also get a power strip with independent switches that allow you to control each device individually. 

You can use the surge protector to power off anything, however, you MUST power off the computer by first clicking Start > Power > shut down.  You don't want to damage your hard drive by abruptly shutting down the computer by using the surge protector.