That is the main thing. People need to stop thinking in terms of kilometers / miles. They have energy stored and they spend energy doing everything, including heat/AC, lights, music etc. Most of those thing are really smalls draws though so we tend to skip them, but heating and AC is major.
However, I don't have a perfect replacement to suggest. We didn't think in terms of gallons/liters before either. We drove until we needed fuel and there was always fuel except in the most remote of locations. As charging becomes common these things will disappear. In most cases we don't need 800 mile batteries, we need to charge anywhere, relatively fast.
The other is that the drivetrain is 85% efficient (give or take a few percent) so any augmentation in drag, from going faster, has a bigger overall effect than on an ICE where the engine is 30% efficient and all the rest is already lost in excess heat and friction. You're applying a reduction on the 85%, not on the 30%.