I have a pantry - it came with the house, so we didn't create it. That said, I love it, and would try and keep a pantry type space if we were re-modelling the kitchen.
It is a corner of our kitchen, and it is a strange shape - 4 sided but the wall with the door on it is at an angle IYKWIM. As you walk into it, the far wall and the side walls are at right angles to each other, but the wall that the door is on is on a diagonal.
In it, we have the double height freezer (on the far wall), wine racks (on the far wall), stash of carrier bags, booze, and all of the food (save for fruit bowl bread bin and the contents of the fridge, which is not in the pantry), which is on masses of shelves on the side walls.
We don't keep it cold using any particular means. It just is cold, as the kitchen is absolutely freezing despite two radiators (extension, with 3 external walls and no room on top of it), and there is no heat source in the pantry. Apparently a marble shelf is a good thing to have in a pantry, because it keeps things on it colder.
I am not at home at the moment to measure, but I can do tonight. I would guess that it is about 4 foot deep and 3 foot wide. Full height throughout.