I remember scratching my head thinking "I'll never learn all this" when I waded my way through the first few pages of my very first Photoshop manual, and it explained the differences between raster and vector images. And file sizes. And file formats.
Whereas these days I have conversations with fellow graphic designers that must sound like Star Trek technobabble to the uninitiated.
bleh.
Go you!! Told you you'd get a job, and would you listen...?