Problem: I have to constantly zoom in and out on my worksheet. The zoom slider is a hassle.
Strategy: Hold down the Ctrl key while rolling the mouse wheel. Roll away from you to zoom in. Roll towards you to zoom out.
Additional Details: Most people use the scroll wheel to scroll up and down. Did you know that you can also use the mouse to scroll side to side? Click and hold the mouse wheel then move the mouse left or right to scroll sideways. This only works when you have a horizontal scrollbar available.