@Logicfest -- I would like to add to that a little bit. Those similar commands are even more handy when you are talking about more complex programs that are in your average office suite. If you are looking at a design suite, then you probably have a lot more commands. If you had to learn a whole new set when you switched from your magazine layout program (for example) to your photo manipulation program, that would get in the way of your getting up to speed on the suite quickly and creating.
Actually, this program group concept has taken over computers. You will find command sets that are very similar from suite to suite even when other software companies are involved. That is very convenient and helps make computers the tools for creativity that people always thought they should be. Those common command, then, lead to consistency and simplicity. Those are both good things.