I can also attest that even if you fly electric, props are also dangerous as hell!!! I was checking a geared 600 motor with a 12x8 folding prop. Just got a new hitec eclipse transmitter. It was on and so was the rx system
While I do not fly electrics, I do have some experience with instructing students with electrics. After the first session, I tell them to rewire with a kill switch in the circuit. I know that is a chore however, IMO, electrics, as they come, are definitely dangerous as I have done and others have done as I witnessed, a bump of the throttle and the saw-blade turns.
Perhaps with more experience I may change that impression, however now -- as in the big gas jobs -- a Kill switch is a definite for electrics bigger than park fliers.