Never heard of KiCad before, looks interesting!
Back in the 70s-80s I'd've killed for something like this.
If it was your design, you drew the first schematics and designed the layout for initial prototypes, ink on acetate with rotrings and a stack of various adhesive pad layouts for different devices. Simulations were on a minicomputer and graphics were crude.
Umpteen jobs ago now, but downloading it for a play.