A month ago I was sent from my job, to a community college to take a class on Hybrids. To make this as simple as possible, not ALL hybrids work the same, Sure, they are electrically assisted engines, but they do not all run the same way, period.
Your basic hybrid, similiar to Toyota's, will recharge when your either slowing down, or applying the brakes.
Now as for the Honda Insight, which helps in many ways with their electric assist, will also supply electrical power, as well as power from the engine, when climbing hills or accelerating. Keep in mind, this electric motor (design and structure) makes its most power at lower rpm's, 3,000 rpm to be exact and runs at 10 kilowatts at this rpm, which is around 12.5 hp.
The main purpose of Hybrid (gas/electric) cars/trucks isnt to run them on electric in general, it is to improve gas mileage and make them burn fuel more efficiently. If you look back in time, 60 years ago, and see throughout the years that our world advances with time, the engines become more efficient.
Now im not calling you a moron, I am just stating the facts. When you were driving your hybrid on the highway, you say your electric motor was not running the vehicle... your correct, your vehicle was running both electric motor and gasoline engine when driving at those highway speeds. If you were to run electric only at those speeds, you would have to recharge the batteries 20 times more frequently as you would put gas in your car.