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I've only played 4e in a live in-person game once or twice in one-shots, so I'm not entirely clear on what people typically do. How do you map out dungeon rooms and stuff in person. I've been relying on the poster maps included in my published adventures, but what do I use to map out dungeon rooms of varying dimensions? Do "Dungeon Tiles" help in that regard?

In our group we have prepared laminated poster paper with pre-drawn grids alongside homemade token holders. Advantage of having a laminated grid is you can quickly draw in the rough layout of rooms and erase it whenever needed.

For IRL games what I use is the mat I got with my Dungeon Master Guide book for 3.5, encased in a 'movie poster frame' complete with cork back, & plastic/glass cover. For mundane details such as a hallway I typically use dry erase markers to draw out the length if there is going to be combat or some such thing. For the majority of my rooms I've taken to using pre-made maps on paper I've made to scale with the grid to place on the mat.

For certain things like a 3d battle that incorporates swimming/flying/etc I like to try and use a second mat/board propped up against a wall (our meeting area involves me in a corner typically) for us to jot down notes on depth/height since I don't have enough money to buy these nifty things that are like pedestals but have a marker to show how high/low they are. Currently working on either purchasing some soon, or just making boot-legged versions for my up coming game.

I also allow players to 'draw' a map in-game/out-game if their characters carry paper and a writing tool so that they can remember certain things if they need to revisit a dungeon (which has happened for looting reasons).