ebrake turns are only faster when they allow you to carry your speed further in to the corner and/or exit with more speed.
Remember that the only purpose of the ebrake is to facilitate rotation, not slow the car. tight switchbacks (about 120-200 degrees) are probably the primary place where that rotation significantly enhances corner speed on asphalt. The gotcha is that doing it acurately enough to be of benefit requires way more talent than I have. Maybe I'll practice at test and tune in April...
