Go run WoD dungeons if you want relatively easy gold. It's not any 'instant rich' level of gold, but you can clear something like Skyreach in about 5 minutes and net around 300-400 gold per clear from that. I'd say that's about on par with other 'normal' methods like (Legion) WQs since for those you have to do plenty of travelling around and some of them are still relatively annoying even at 120.