If you regularly work in multiple programs at the same time, minimizing and maximizing software windows eats into your workday more than you realize. Minimizing Outlook, checking an entry in Excel, then switching back to Outlook also breaks your attention and makes it hard to get back on track.
What are you waiting for? Get a second monitor. If you need maximum screen space to edit videos or do serious stock-market trading, maybe even consider more than two monitors. Nothing makes it easier to whip through tasks and applications.