Yes
(I mean, I think the advantage is that you are able to speak to more people easily and in their native tongue, which is a whole other advantage, but that's different than "expanding your mind" directly by learning another language.)
I went to high school in Ontario with anglophones who took French immersion, learned fluent conversational French, graduated high school legally credentialed a bilingual, but then proceeded to move to Toronto and never really leave the province. I don't like being judgmental about people's worldly experiences, but I don't think that those high school French classes really did much to colour their worldview, most of us just knew it as a reliable way to secure a 90+ average.
It's all about the economic weight of those speakers and the desirability of living in the countries where the language is widely used.
There's a reason English is so far ahead of Mandarin or Hindi.