Prep - I do not run a game unless I am well prepared. That does not mean there is no improvisation, quite the opposite. However, I have encounters built, maps ready, and story hooks ready.
Scenery/figures - I own tons of scenery and painted miniatures. I own every dwarven forge set - multiples of most - and every mold made by Hirst Arts. It's a part of the game I really enjoy. With a dedicated gaming room (owned by a friend) I can quickly build up the scenery for an encounter in a couple of minutes. Plus, being able to store all of this stuff outside of my house has probably saved my marriage! It makes for a very visual game, which my players enjoy. I under stand this would not be a positive for some groups.
Props - Aside from scenery and figures, I make a lot of props. Scraps of vellum scrolls, maps, messages, coins, if there is something in the adventure that lends itself to a tangible representation I try to create one.
Treat Everyone with Respect - If someone does not fit our group I talk with them directly. I try to keep the group inclusive and open and gravitate to players with play-styles that match my strength.