Overworld Design Help

Its been a while. I stopped using ZC a while back because I got fed up with all the bugs in the beta builds and I was too spoiled to go back to 2.10. But now I'm back and I'm working on a 2.10 quest. I have a question though. How do those of you who have actually made a quest start to design an overworld? I'm fine when it comes to dungeons. RM2K taught me well the art of making dungeons. But I find myself at a complete loss when it comes to designing the overworld. My so-called overworlds (what I've finished of them) always end up being very linear and dungeon-like. Any advice?