Over the last 45 years I've used the kill switch once on my Suzuki 80, my Honda 400F and my BMW K75.
All except for the BMW were caused by dropping the bike due to wet conditions.
The BMW was due to a @*&%## in a '78 Ford changing lanes into me.
None of the times I needed to use the kill switch made it easier to use than just reaching over and turning off the ignition key.
The only reason I didn't use the key is my preconditioned response to the situation was, "TURN OFF THE KILL SWITCH".
Had it not been there, I could just as easily have thought, "TURN OFF THE KEY".