Personally, I think I started with CBOT. Then some JavaScript and Lua but
nothing serious, really. Just simple scripts for a website and hacking some
Battle for Wesnoth's hidden functionality (I guess it was adding a new status
icon for units). Then I learned C as a part of my studies. The rest of them
(C++, Ada, Nim, Java, Python, Fortran, Scala, Rust, I can't remember the exact
order) was easier. But that's not because, or not JUST because of low-level
stuff. It was due to syntax. And here I think Nim would do better: imagine
folks spawning ptr like crazy to learn about the memory layout of various data
structures.