Yeah, those are "poor man's" 2-layer boards. They're constructed by screen-printing a layer of lacquer, then a layer of conductive carbon-filled polymer, then another layer of lacquer on top - that's why the resistance is so high. In some designs the inherent resistance is intentional (but the tolerances are dreadful), in others it's low enough to ignore.
Obviously these are only used for low-current signals. Also, you might've noticed the SMD jumper links on the left side of the board; those are rather more expensive than through-hole wire links, and are used more sparingly (hence the film jumpers).