Interesting discussion. I know one or two people who have taken E tablets and have asked them about this situation. They say the effect of the E lasts about an hour bring a great feeling of happiness and well being to the user. Afterwards though, there is no 'hangover' or anything like that, just tiredness because of all the energy used up whilst under the influence.
A few hours later and he would have felt normal enough to drive a car or ride a motor bike, they couldn't comment about flying a plane as they are not pilots so do not know what is involved.