I'm not sure why Eastern Europe shouldn't be a valid term for talking about the countries in the east of Europe, though? After all, your own comment seems to refer to Western Europe as a group, as well.
It seems to me indisputably true that there are large groups of related countries in Europe, and as a French citizen I do not have any problem with being grouped with Western Europe. Sometimes Southern Europe even, or Latin. "Eastern Europe" doesn't seem less relevant for the countries that are east of Western Europe.
I have travelled a bit around Europe, and I certainly do feel more "at home" once I am back to somewhere west of the German/Polish border, anyway. I'd expect it to be the same (reversed, of course) for those who come from Eastern Europe.
It seems to me indisputably true that there are large groups of related countries in Europe, and as a French citizen I do not have any problem with being grouped with Western Europe. Sometimes Southern Europe even, or Latin. "Eastern Europe" doesn't seem less relevant for the countries that are east of Western Europe.
I have travelled a bit around Europe, and I certainly do feel more "at home" once I am back to somewhere west of the German/Polish border, anyway. I'd expect it to be the same (reversed, of course) for those who come from Eastern Europe.