English muffins are defined by their porous nature and are designed to absorb external flavors, like butter, hollandaise sauce, and marmalade, better than other types of bread.
Bourdain liked his toast crispy and dripping with grease, but his dislike for English muffins might also be due to his general dislike for brunch and eggs Benedict, in particular.
English Muffins tend not to get too crispy, and even if you toast them a little longer than needed, there is a good chance that the center will still be a little spongy.