Electric bikes come in a wide range of configurations.
There's no set answer to how it feels.
It also depends on how you ride it.
I've got a pedal-assist ebike as a winter commuter.
Means I have to pedal for the motor to engage.
And the motor disengages at 25 kmh/16mph.
Thing is, I LIKE to pedal.
My average (unassisted) speed is 28 kmh/18 mph.
So to me, an ebike means a few seconds of boost - like having someone giving you a gentle push at each intersection, and that I climb pretty much any hill at 25 kmh/16 mph.
So really, the main difference - once I'd got the riding position dialed in - was the width of the crankset. Mid-motor cranksets run wider than regular cranksets. Feels odd.
If I'm tired - riding below the cutoff even on the flat, the "economy" setting feels like I'm riding with a strong tailwind. The "normal", again, feels like someone providing a gentle push.
Don't use the "max" much as the engage/disengage gets too sudden for my liking.