First, I am looking forward to the interface makeover of Blender. I use Blender often. It is an amazing program. I do have issues with it, the most frustrating is the interface.
Second, Vue. I have a contact on Flickr who uses Vue. His heart is in the right place, but to be honest, his images are nearly always very novice. It is not for his lack of trying, I think it's Vue itself.
I don't want to bash the program. I used it for about one week, frankly good old VistaPro is a better program. (hmm, guess that is a bash) Anyway, I have seen few Vue renders which come close to what a novice can do with Terragen 2. I say use which ever program is best suited for your requirements and taste.