Is Latex Still Worth Learning?

Bocaj asks: "I have start back to college and have to write a few technical papers. Right now it's mostly physics, but I'm a CS major and there will be many more papers to come. I've tried all of the office suites with little luck in getting them to format complex formulas correctly. I'm trying to learn Latex, but I am wondering if I should. Is Latex still the defacto standard for this kind of stuff? What about SGML or XML? What is everyone else using?"