I think Kotlin solves it quite nicely with the trimIndent. I seem to recall Golang was my fav, and Java my least, although I think Java also finally added support for a clean text block.

Makes cut 'n' paste embedded shader code, assembly, javascript so much easier to add, and more readable imo. For something like a regular expressions I really liked Golang's back tick 'raw string' syntax.

In Zig I find myself doing an @embedFile to avoid the '\\' pollution.