I don't like leftover baked potatoes, so you're not alone. But then I'm also not overly fond of russet potatoes, the variety generally used for baking, so cold, blah! Well, except as French fries..........
However, varieties like redskins and Yukon colds, which I prefer to boil or cook in the Instant Pot, are fine cold. We keep some of those in the fridge to keep us from making bad choices when wanting a snack. You could also try microwaving, which is quick and easy.