Automatic opening doors but they don’t open by a proximity sensor, they open when you press the button. This is the optimal solution as the door doesn’t open needlessly but still allows for ease of access.

Ordering machines, where all your menu options are clearly listed and priced. Pressing on a combo of buttons will print a receipt which you can sit down and show the staff/cook your order.

Water (hot and cold) tapped straight to your dining table for self serve drinks.

Unfortunately becoming less applicable with the smartphone domination finally reaching Japan, but their flip phone technology.