Whew... Few additional points:
BJJ is NOT "the most useful of the martial arts." It is very useful, but there are other things that are equally useful in their contexts. It all depends on contexts. For example, I think that BJJ is more useful for a civilian woman interested in anti-rape/self-defense than a Navy SEAL interested in military CQC.
BJJ is not a primarily strength-based grappling system. It is leverage-based! In that regard, it is VERY DIFFERENT from Greco-Roman or freestyle wrestling, which is very much power- and explosiveness-based.
Best I can do is to say, go to a BJJ school, pick a little woman or a really small guy and ask him/her. He/she will make you (a presumably bigger guy) feel helpless on the ground and may toy around with you (that's what happened to me the first time I tried it - man, was my ego hurt!). I guess seeing (or feeling it) is believing...
The rest, M1911 answered well. A drugged "big guy" may be pain-tolerant, but he cannot violate the laws of physics. He can be thrown on his head just as easily as anyone else (probably easier due to his lack of control and balance). No matter how drugged, if his elbow is broken, he will not be able to use his arm. An one-armed man is a whole lot easier to deal with than a two-armed man!
Think of joint-breaking techniques or chokes as not the "end-all," but as a means or a tool to make it possible or easier for you to attian a superior position, disengage, escape, survive and so on.
Lastly, you are right in that the "mat" is not the street. But, training full-force, fully-resistant on the "mat" is heck of a lot more realistic approximation of, and effective training for, the "street" than practicing punches, kicks or eye-gouging in slow-motion.
Skorzeny
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For to win one hundred victories in one hundred battles is not the acme of skill. To subdue the enemy without fighting is the supreme excellence. Sun Tzu
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