If you are using a recipe that specifies to use room temperature eggs, you should not use them right out of the fridge.  Adding cold eggs to certain things, such as cheesecakes, could make the batter appear curdled or lumpy and affect the texture.  Avoid this by letting your eggs sit out for 30 minutes.  Additionally, you should use room temp eggs in recipes that call for beating eggs or egg whites until foamy, so you achieve greater volume.