Electric motors do not have a flat efficiency curve across their rpm range. There is a peak efficiency point, just like in an ICE, though the efficiency curve is generally a bit flatter. Both at no load and at stall the efficiency drops to zero. If the peak efficiency point is not matched to the power required for steady state driving, which it can't be for all conditions, then pulse and glide could certainly have some benefit with electric motors as well. Likewise, overly rapid (or overly slow) acceleration will reduce the efficiency of the motor, so there are some savings to be had be driving diligently and being aware of the motor's properties, just as with an ICE. Regenerative braking only scavenges a small percentage of the kinetic energy of the vehicle, so looking ahead and choosing your speed and following distance to reduce the use of brakes still helps.