Robert Applegate in his excellent little book "The General Care and Maintenance of Kingsnakes" says, "Milk snakes are members of the large snake family Colubridae that belong to the genus Lampropeltis, making them a subcategory of the kingsnakes (all snakes in the genus lampropeltis are kingsnakes), and to the species triangulum which distinguishes them from other species of kingsnakes."
I can see why you say you dont consider triangulum and getula the same animal, they are different species. Kingsnakes are a genus though, and there are 8 species. Lots of folks dont think of milks as kings because of the common name, but milks bear a striking resemblance to the tri-colored kings like pyros, zonata, and some mexicana like ruthveni (which was originally thought to be a milk) and milk snake phase thayeri. Milksnakes get their own forum here maybe because there are about 25 sub-species. I respect your view that you dont consider them kingsnakes, I guess because of the common name, but in my view they are.