The key to making a hot dog bar super efficient is in the proper layout of the grilled hot dogs. Once grilled, lay them out side by side, already placed inside of their buns. This will allow guests to simply grab their hot dogs and make their way through the vessels of condiments.
Keep your chili easily accessible towards the front of the table. Since it's messy, you can avoid any spills by keeping it away from other vessels which the chili could drop into. It's also wise to consider replacing or reheating the chili every 15 to 20 minutes to avoid guests placing cold chili on top of their hot dogs.