Yes, I'm that player who is still new to playing the DLC. I just started a new game and on my way to Megaton, there are a ton of floating cars, tin cans (bent and otherwise), and the ground rendered full of bumps such that while walking my screen shook and the sound effect of jumping/hopping down kept repeating. I walked into Megaton and the NPCs were doing the same thing. No worries, I just exit the game entirely, and reloaded.
However, the random floating objects kind of irritate me. They weren't so prevalent in my vanilla game, and it's making me seriously consider uninstalling some or all the DLC. Does anyone know if there is one particular DLC that causes all the floating objects, or is it all of them?