I've seen it used a lot in I/O from micro-controllers where speed/timing is important. The arduino C++ library for instance does some weird things under the hoo

I've seen it used a lot in I/O from micro-controllers where speed/timing is important. The arduino C++ library for instance does some weird things under the hood when reading from an Analog-Digital-Converter (read the voltage at some pin), whereas with assembly you know that you can read in exactly 1 instruction. When timing or speed are important, that level of control is useful.