Here's a little something I've read on the internet:
"Bethesda promise that the game’s dungeons will be much more varied than they were in Oblivion. Where Oblivion had one dungeon designer, Skyrim has eight. The team will be working on keeping Skyrim’s dungeons varied with puzzles and traps, to ensure that “no two areas are alike.” An example of one such dungeon is the Bleak Falls Barrows, which features ancient Nord catacombs carved between huge tree roots and underground rivers. There will be 120 dungeons in total. "
I hope that eases your mind.
More on the subject here: http://www.pcgamer.com/2011/02/08/skyrim-has-a-hand-crafted-world-with-no-two-areas-alike/
I've also read that dragon shouts have a cooldown which affects all shouts. So you can only use one per day. The shouts are also rather different from normal spells, both in casting and effects. Did you know that all spells in Skyrim can now be cast in 3 different ways? I think dragon shouts only have one way of casting. I've also read that there is a dragon shout to slow time as well as to call upon a dragon. So I think they wont be your average kind of spells that you would use to get an enemy down, still leaving room for normal mage spells.