Smalltalk may be influential, but is now rarely used.

The code block approach is widely applied in two massively used industrial languages though: Ruby and Kotlin. In Kotlin specifically it's one of the very central features.

And Ruby has been strongly influenced by Smalltalk.

Anyway, if you want something perhaps a bit more used, you can check out Pharo. I think that is the most used Smalltalk-like language these days.