The Value of Learning Basic Data Structures

In C, if you want to have a variable number of anything, you don't have very many choices other than linked lists. So it was an absolutely standard skill and awesome that it's not anymore. Did you find any of the stuff you learned about that in school or elsewhere useful on the job? I wish I could say that I did. But literally nothing that I can think of that I learned in all the time I was in school, have I found applicable in my work.