I don't like massive baked potatoes, they take too long to cook. If I want a lot of potato, I'll have two.
I particularly like the four packs of Extra Special/Taste the Difference ones that Asda or Sainsbury's do, with some or all of tuna mayo, grated cheese, cottage cheese and butter on them.
5 minutes in the microwave and then 5-10 minutes in the oven at full blast means you can have a crispy skinned potato without having to wait hours for it to cook.