One of my favourite things about working with Vala¹ was being able to use Genie² with the off-side rule syntax where it felt appropriate. Some chunks of code feel better to me when structured in certain ways.

I often find myself wondering why other languages haven't implemented support for an alternative syntax. I suspect the answer is that simply no one cares enough to put the work in, but perhaps there is a better reason.

¹ https://en.m.wikipedia.org/wiki/Vala_programming_language

² https://en.m.wikipedia.org/wiki/Genie_(programming_language)