In Georgia they worship in Georgian, but there was a period before the Communist revolution where they were required to worship in Slavonic for political reasons, and it was really difficult, and apparently drove people away. From what I gathered, they have strongly negative feelings about the cultural imperialism of 19th Century Russia. They'd be Orthodox but not go to church except for things like baptisms, and continued that under communism, until the past few decades. They've restored the old diocese and liturgical traditions.
Albanian Orthodox in Albania worship primarily in their own language, and have been publishing a lot of liturgical texts for the past few decades, since coming out of a crushing atheist communism.
Apparently in Kosovo they're apparently worshiping in a mix of Slavonic and Serbian. I can't tell the difference, so I'm not sure what the mix is.
In Project Mexico they're worshipping primarily in Spanish, and some of the parishes in the Southwest US are experimenting with integrating more Spanish into the services, or having liturgy once a month or so in Spanish. at the little monastery in northern New Mexico they're using Spanish, Slavonic, and English.
EDIT: To clarify, of those only Georgia is actually an "Orthodox country."