recceguy:
Totally wrong. In cruise and stabilised flight, you get from an AOA all sort of useful information (LRC, gliding speed...) Euh, also using the AOA for the take-off phase is something I never heard of...
The problem with trying to use AoA at cruise speeds is that AoA varies relatively little with changes in airspeed but at climb out and approach speeds it varies rapidly and instantaneously with pitch. Although I never used it on the roll, in climb out it gives you a rapid means of finding L/Dmax which is needed when you lose an engine. In fact, the procedure for losing an engine off the catapult is to rotate to a specified AoA. You could also use it to find the best glide speed but it would be very sensitive and thus hard to hold at those higher speeds.