I still use reverse polish calculator (on my phone) but I'm not used typing it left to right but executed right to left.

For example in uiua:

    * + 1 2 5

Pushes 5 on the stack, then pushed 2, then pushes 1. Then pops 1 and 2 adds them together and pushes 3, then pops 3 and 5 and multiplies then together

Reverse polish:

    5 2 1 + *

EDIT: it does makes sense in the context of an array language