No experience with haggis, but lutefisk is every bit as vile as it's made out to be and repeat exposure does not diminish the repulsion.
Haggis isn't revolting like I imagine lutefisk to be. It's just kind of gross. The texture is shitty; the taste is shitty; the thought that you're eating a stomach is shitty. Eating a weird part of the animal is fine if it tastes good (e.g. tripe or balls), but when it doesn't it makes the experience much worse. The first time I had it I was three sheets to the wind and threw up shortly after. It was probably unrelated to the haggis, but it still left a bad taste in my mouth.
Lutefisk is like if someone took the galvanized steel garbage can that the fishmonger uses without a liner and then filled it full of water and boiled grapefruit in it. The grapefruit is the lutefisk. It has an incongruous texture and an aggressively rotten taste. With gravy.
This comment was a train wreck that just wouldn't stop
