My understanding is that this tweet https://twitter.com/taylorotwell/status/590281695581982720?l... kickstarted the Vue popularity. Taylor Otwell is the creator of Laravel.

Here's Evan You (creator of Vue) https://youtu.be/D_z-RAweP1k?t=3m9s talking about the tweet.

WordPress.com uses React[1] and the new WordPress CMS Gutenberg[2] editor is also using React. (Just FYI)

[1] https://github.com/Automattic/wp-calypso

[2] https://github.com/WordPress/gutenberg