Swindler vs. BM/Journeyman, for sure I'm going to turn your Silvers into Swindlers, if there isn't anything worse. It's rarely correct to give you back what you actually wanted to add to your deck. Likewise, with Gold, if there is any other $6 at all, even Goons, you're getting that, because even if it's objectively a better card, it's worse for your deck.
As for Journeyman in Chapelled decks, I think it's not a nombo - you can skip your stop cards in order to more reliably draw your deck, which means you can have more stop cards without gumming up. We've all had unreliable engines producing turns like "Village, Smithy, Bridge, play two Coppers".
There's possibly a synergy with Poor House worth mentioning - always name Copper, and your Poor Houses stay valuable.