If you're working with C++ (and I'd imagine C), knowing how to debug the assembly comes up. And if you've written assembly it helps to be aware of basic patterns such as loops, variables, etc. to not get completely lost.

Compilers have debug symbols, you can tune optimization levels, etc. so it's hopefully not too scary of a mess once you objdump it, but I've seen people both use their assembly knowledge at work and get rewarded handsomely for it.