I’ve never noticed it either, but as we should know by now, personal impressions on whether or not a word is in common use can be very misleading.
There are seven hits in the Corpus of Historical American English, going back to 1983, including two references to YouthQuake magazine, which evidently existed c.2000. The Corpus of Contemporary American English has twenty hits, going back to 1991. (That database starts at 1990.)
The News on the Web (NOW) Corpus has 194 hits going back to 2010. There are hits from all over the English-speaking world there, but a high concentration from New Zealand. The Oxford Dictionaries announcement mentions that the word is particularly popular among Kiwis.
That announcement also notes a first citation from 1966 in Vogue, a US magazine.
And a quibble with the title, this is the Oxford Dictionaries WOTY, not the OED WOTY. The OED and Oxford Dictionaries are not the same thing.