I actually did have to use my trig once. Once.

One time, years ago, I was building my own desk, and while making the design for it, I needed to determine how long the (multiple, intersecting) diagonal supports would be, to figure out if I could manage to build it without buying an extra board worth of lumber. Turns out, I could. And knowing that let me build the desk without wasting the price of an extra 2x4. Knowing trigonometry saved me several dollars! Several!