Our homeowners insurance policy covers damage by electrical surgers, so I don't worry about it. I do unplug my sewing machines when I'm not using them if I think about it. However, we never unplug the computer or any of the TV's. If we need to let the insurance replace anything,then that is why we have the insurance. I unplug my sewing machines because I can unplug them at the machine and they cost many times the price of the computer or TV.
However, you can have an electrican install a household surge protector outside the house that protects the whole house and is cheaper than replacing even a small TV or sewing machine.