Finally bit the bullet and got wonderdraft, and I'm so mad I didn't sooner. I have been able to convert my older flat maps I've been using for years for my homebrew D&D campaign into a much more vibrant form, and I'm loving it. I would love any feedback people have, or some tips on how to ensure my map has texture and is visually interesting without being overly-busy. I've got two more continents that I've cropped out, as they're still a work in progress, so I'll likely end up applying what I've learned here to them.
If anyone has some recommended asset packs, free or paid, I'd love to hear about them.