I do agree with you about the usage of the back brake and what happens. By the time I get to use it I am sat up using all at my disposal to scrub off the speed: wind, engine, front brake and an amount of rear brake. Jumping on it in a panic is just as you describe!
I have made the mistake of over-breaking on the rear only once. At 130mph I pushed the rear break on my FZR600 (this goes way back, some 20 years or so) really hard to avoid colliding with an obstacle. The asphalt was hot and smooth (Greece in July- some of you may know this can feel like porcelain tiles), next thing I knew was that my rear was trying to overtake me. Drifted for approx. a second or so, then rear wheel caught grip again and pushed over to the other side- drifting again for a second or so, still doing some 90mph shooting past the stationary obstacle. I remember feeling the frame of my bike twist, hard to describe really. Managed to get a foot down and straighten her out, stopped some 100 yards past the obstacle. Slightly shaken, but unhurt. The morale- I choose to use my rear brake to only support my front break where necessary (i.e. to provide extra stopping power or in situations where using the front break hard would likely cause problems such as on wet/slippery roads in bends with extensive road markings, or back home where we have PROPER winters with real snow and ice ), but probably use the front brake over 70% of time; commuting to work these days, i need around 2 front tyres before I have to replace a rear tyre.
