Only a few days ago I was riding into a headwind on the hudson river bike path and a woman on a cit-E-bike passes me, maybe 2-3mph faster. Looking for some relief (with 3 gears, its either doing squats on the big gear or pedal like my chain fell off in the middle gear), I caught her wheel and stayed on it, but it was more dangerous with non-riders like her since she was constantly lightening up on the throttle whenever she encountered another rider ahead of her. I have to keep a wheel distance and maybe ride slightly to the side so I can see what's ahead. I eventually stopped drafting off her and went off on my own to chase some joe schmo that passed us in his tourist bike (not tourists on a bike, but the ones that usually holds panniers).

But then, going at high speed on e-bike also allows one to maneuver beyond their normal ability if they were actually pedaling... specifically delivery people on an e-bikes that darts left and right without slowing down one bit. I tried to suck the wheel when one was are going around 23-25mph on the same bike path. I didn't have the agility at that speed to constantly avoid cyclist/joggers/strollers and maintain that speed, thereby constantly having to jump back to his wheel and eventually losing it.