@Phronema, you're also right here, in my experience. The way I took what
@nicholas123 said (maybe I was wrong) was: the majority of nominally RC or EO people in the world could give no coherent account of theological or practical differences, and it seems to me that's true.
I think the convert-heavy parishes you and I know are not representative of laypeople throughout the world.
Example: Romanian woman (wonderful person, very active in parish, sings in choir, teaches little kids) from my old parish asked about my background. On hearing it, asked me about Roman Catholic "differences.". I said (unsure what to say) " well, you know, theological differences, they have a different Creed..." "It's different?" "Yeah, they say that the Spirit proceeds from the Father
and the Son..." She was genuinely surprised. As if she was hearing this for the first time. Now, some people might have guessed "wow, she's from this Orthodox country, sings, she must know this basic stuff.". But she didn't.
Similarly, as I've said, I have met Russian people who consider themselves Orthodox but have not been baptized. They're not aware of baptism as a sacrament. They think it's a kind of " good luck" ceremony available to babies. At least one of these people communes on Pascha.
None of this is to say anything bad about people. Simply that the internet Orthodoxy / Christian enthusiast talk we have around here, whether from savvy EO, OO, RC, AC people, is just not the norm in my experience.