There is always at least two ways of doing something on a Windows PC. If you've learnt by doing, rather than from a book, you probably only know one way. Watch your mother use a word processor one day -- I bet she uses File > Save rather than hitting Ctrl+S. What about you? Do you know your shortcuts?
Keyboard shortcuts are by far and away the best way to a) speed up your work flow and b) prevent RSI. The single worst thing you can do, as far as your wrist and elbow is concerned, is move your hand to the mouse. The best thing you can do is read this list of shortcuts and be amazed at what you can do with just a couple of keystrokes
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