Ergonomic AND energy efficient

FWIW I don’t think it’s really all that energy-efficient. Air, being much less dense than solids, contains comparatively much less heat energy. The “cold” of a refrigerator is mostly stored in the things inside it, not in the air inside it, so letting all the cold air out to be replaced by warmer air does not have a huge effect on the overall temperature of the fridge. I think you’re right that having a door which interferes with the insulating envelope is going to be worse than just opening the main door once in a while.