In my experience, reading assembly, and being able to anticipate roughly what the compiler is going to produce is much more important than writing assembly. Learning to write a bit makes you better at reading it.

Next time you have some tricky inner loop showing up in profiles, write a few alternative implementations, benchmark each, and use the -S flag to get gcc/clang to dump out assembly.

There are some people who write a lot of assembly language, but I think orders of magnitude more people read assembly regularly while writing it rarely.