The reason is that programs like WORD write far more code than what the page needs, and because of this, they take up far more space. But taking up space is only part of the problem. This latter, however, is not as daunting as you might think. Most editors come with automated wizards that not only will help you perform a task, but also teach you what it is doing. You might also be concerned with price.
Some editors can cost hundreds, even thousands of dollars.
While these are certainly nice programs to have if you are going to create a large and commercial site, there is no reason to spend money for a personal site. There are a number of FREE programs that you can use to create a webpage. But, there are also a number of free programs out there that are easy to use and even better than Frontpage Express. There are number of others that I could mention here, but this is enough to get you started. I should also mention that there are plenty of sites on the internet that supply free graphics and templates for you page, and you can easily find these with a simple search.