Hey Chris I find your responses totally in sync with my thoughts there. Change is constant and two strokes of the 70's were very different than of the 90's. Powerbands became wider and smoother as designers worked on increasing rideability.
I'm impressed with those E-tec engines myself, my brother had an outboard with the setup. Fuel injection is pretty impressive stuff, my brothers bike (wreck) was sat up for well over a year outside in the weather. I wanted to borrow some parts off it and thought to kick it over. So I plugged up a battery and it seriously started and ran first time!!
I think with the injection system being closed loop and sealed it prevents the lighter components of the fuel from evaporating.
Personally I don't have an issue with being nice to the environment if we can, I have friends who still choose to race with leaded fuel and I think that's pretty aweful really.