I don't think you have to worry about the areas being any less "lush" or interesting than they are now. In fact, I'll contend, they'll likely end up being even more interesting and more diverse and lush. For one, they're giving each sub-region its own feel... I don't know if you caught the quick screen-cap that Yoshi put up during his live Q&A, but you can make out enough between the color schemes of the map itself, and the small thumbnails detailing each location to see there's going to be a bit of variety now in the areas.
For another, the way the maps are set up now looks fine graphically. There's tons of detail to be seen in the texture art, the environment models, etc. The problem is, there's no personality, nothing distinguishing one location from another. There are no key landmarks to look for (in most cases) to get a bearing on where you are... because everything is the same. It's very homogeneous.
Yes the map is very handy, as it should be when you're in more unfamiliar territory and don't know your way around as well yet. But when you've passed through the same areas dozens of times and still need the map to get your bearing, simply because there's nothing to set it apart from any other instance of that same exact map section... that's a bit much.
No lie, at one point I started counting the number of little streams I'd crossed to know where I was in Black Shroud without having to open the map as much.
In FFXI, you could blind-fold me, drop me in the middle of almost any zone and within moments of unblindfolding me, I could tell you where I was and, further, whereabouts on the map we were... just by looking around. That's because XI's area designs were more varied, certain "skylines" or land structures became familiar and stood out because they were unique - or nearly unique - within that given area.
Even within dungeons, there was usually enough variety from one area to the next that you could figure out where you were. The only place I seemed to have trouble with that was the area of Eldiemme with the gates, 'cause its design was basically the same layout mirrored 4 ways. The only indication I had in there of what end of the map I was on, most times, was finding out which gate I was closest to.
To be honest, though again, it looks great grapically layout wise, the areas in XIV are boring as hell right now. Way too repetitve, way too homogeneous and way too uninteresting.
Yoshi-P and team seek to fix that.
Better yet, the changes will play into a world event that's going to change Eorzea as we know it, not only geographically, but apparently in terms of the storyline and such as well. So it's not like this arbitrary "Black Shroud used to look like this... now it looks like this" just because. There will be lore to support it.
Personally, I'm psyched.