At DCA I guess Cars Land, a bug's land, and Hollywood Land. But generically speaking, the internet seems to think Disney has regularly, if not consistently, used the term to describe the areas of the park in its marketing communications. But I don't think the use of the word "land" in the official name means much, we all know New Orleans Square and Bear/Critter/Bayou Country, Toon Town, and SWGE among others are "lands." We now Villains Land will be a land regardless what ten-word name with colons they give it.
But I agree with the point you are making about marketing and why different words other than land would be used, particularly to sound more innovative and modern or convey some other quality.
Personally, when I heard Avatar was going to be an "experience" I saw it in glass-half-empty terms. That's because I wasn't excited about the IP and Disney has a long history of short-changing efforts at DCA. So my interpretation was "oh great, not even a land."
But the more I think about it, I think the word "experience" is what makes sense when something defies or spans categories. A restaurant is a restaurant, a show is a show, a restaurant that includes a show while you eat is an experience. And it got me thinking: is it possible that having seen Rise that James Cameron said "yes, let's do another park project but it has to be the new best thing Disney has ever done." If it was going to be innovative and multi-phased, would they have described it as an "attraction" or the area as a "land"? I think both words would have sold it short if the experience was truly special. If it was really something remarkable the word experience makes sense. That's my glass-half-full interpretation. I have no expectations, just some thoughts. But, yes, trying to discern meaning in Disney's statements and actions is bound to hurt the brain.