"Surge" means virtually anything including as you suggested "spikes". In 2004 I looked at about $3,000 of electronics and for the first time bought a "power protector" also know as a EMS unit. It protects against "spikes", high/low voltage, reverse polarity etc.
So I installed a PI HW50C and have been protected against numerous CG faults. In my current rig the HW50C was free as in $0 - Yup I moved it from the last rig.
Unlike your house CG power especially at the pedestal is often worn and abused. And the entire distribution system may be suspect - Yup I had one occurrence of 160V on a 30A pedestal.
It's like insurance - your choice.