I was always amazed that more physics curricula do not require linear algebra. You don't even need to get to quantum for LA to be amazingly helpful. Our classical mechanics text from undergrad was swarming with LA...
I was amazed that my EE degree didn't required it. We had a rushed treatment as part of a required ODEs course, but I didn't really get it until I took a theory heavy course dedicated to the subject. It and probability both made my life a lot easier and are essential parts of my daily work.
