Note that in both cases, there are a few fine points. With the Zargg Method, Auto-Zoom needs to be off. The method described in the tip works best if Auto-Zoom is off; however it will work if Auto-Zoom is on, although the disadvantage is that the track will not expand to fill the space so you have to drag the track bottom separator bar down manually. Also note that with the tip version, all tracks other than the one you're working on are actually hidden. So if you resize the track height to be higher than the available space (e.g., you want to see really low-level noise), then the vertical scroll bar will scroll solely that one track.
Also in the tip version, if you have more than one track selected, they will resize so each one takes up the maximum amount of space possible. This can be very useful when doing edits in two tracks that reference each other (e.g., drums and bass).
So Zargg's option is fast, convenient, and will cover most use cases, but the tip version lets you go into a bit more depth if needed.