Pages are different from post in many ways. One of the main differences is that you can have a whole page and more sub pages for that page and it can be totally different from your post. It helps keep your website organized and nice.
On my website I plan to use both pages and post for I feel like the using both will help keep this site more interesting and organized.
I am starting to see power and the frustration in WordPress. The power I am seeing is that it is easy to create a website for what you want. The frustration I am seeing is that what I see when I create it is different from what goes on the actual website.