Personally I'm fairly fluent in English and Slovenian (to the point of having published short stories in both languages in magazines) and I have to say I don't even differ between the languages anymore. Most of the time I'm not even aware which particular language I'm listening to and it's happened before where I was watching a programme in Slovenian and thought the actors were talking English.
However I can't say this has beneficially affected my ability to multi-task. I certainly seem to try multi-tasking a lot and can't even not do it, but as to whether it's effective or not, I couldn't really say. People around me seem to dislike me doing it (especially when I hold multiple conversations with them at a time), but it's just the way my brain works. I can't not do it.
This makes achieving a state of flow somewhat hard, which sucks terribly.
However I can't say this has beneficially affected my ability to multi-task. I certainly seem to try multi-tasking a lot and can't even not do it, but as to whether it's effective or not, I couldn't really say. People around me seem to dislike me doing it (especially when I hold multiple conversations with them at a time), but it's just the way my brain works. I can't not do it.
This makes achieving a state of flow somewhat hard, which sucks terribly.