A part of what programming/comp-sci deals with is rapidly changing and somewhat disconnected nomenclature. In the 90's, you may well have been "corrected" that it's the Gang of Four Visitor pattern. Map-reduce, if that's what you're referring to, didn't become popularized until later.

Again, Alan Kay is right -- computer programming is "half a field" that often forgets its own content. Ironically, programming patterns were actually forwarded as a form of technical literature for the programming field, not so much as an approved cookbook.