I love deserts... there is so much mystery involved with deserts. From Ossymandeus to Heavy Metal to all sorts of religion. All sorts of stuff happens in the desert! Religions get started there, strange relics get found there, lost cities, and all sorts of things. They are typically bigger than forests and more variable to travel in than mountains. (in mountains you have paths and passes and not much else) In this respect, I should love oceans (essentially deserts made of water rather than the lack of it...) but I don't like them as much.
I dig forests, hills and mountains too. Somtimes plains, but give me the desert any day.
But keeping the desert in mind, almost all terrains can use the same things. Everything I like about deserts could be applied to forests for example. You just cant see as far...
Aaron.