I can honestly say that the relatively few hours of training I gave for the initial multi rating produced more scary moments than all of the PPL,CPL, Night, Seaplane, IFR, Flight Instructor, Aerobatics, Formation, and glider license training I did combined.
EFATO is IMO the most dangerous exercise in the initial multi engine rating syllabus which is why I did all the training as an overshoot to a simulated runway that was set at 4000 ft AGL