American media will sometimes do this for things like interviews or documentaries. They’ll let the non-English dialogue or response start and then bleed in a translation. This is mostly done for nonfiction though. Fiction is more of a subbed-or-dubbed thing.

Voiceover is much faster and cheaper to do than a professional dub, and can be done by a single voice for all characters. Since most cool movies / cartoons / series got to the audience in Eastern Europe through pirates, and pirates would only do voiceover, voiceover became a cultural norm for a while, even for officially released stuff. It has now shifted towards dubbing though. In the 90s, when the piracy was at its peak, there were several competing pirate studios in Russia that raced against each other releasing as many movies daily as possible. Some even employed simultaneous interpreters who would do the voiceover without watching those movies first, so listening to them was... an experience in its own right. One of those interpreters became a legend in the professional community and he claims to have done up to 8 movies daily at some point. He is responsible for infusing the Russian language with his translation of "holy shit", which is "god's diarrhea"

Only in Slavic countries? In Romania we had written translations. Got to listen to beautiful American, Italian, French, heck even Russian artists directly.

When I was kid made me want to learn how to read faster.

My brain doesn't even notice anymore that I am reading a translation. Now, even if I speak fluent English, I still like the captions on, they add something to me.

Learned this the hard way when I torrented Pillars of the Earth. Definitely weird hearing an incredibly disinterested person just reading in the same voice for every character.

Czech, Slovakia, Hungary and Germany/Austria have a very long tradition of professionally dubbing movies and TV series. There's iconic dubbing artists that were associated with specific actors. There's industry awards as well. You'd be hard-pressed to find single voiceover movies or series unless they're documentaries perhaps