Dreamweaver makes a rough version of the final web page. Since different OS and browser combinations can render text differently, you will never know exactly how it will look to a user.
If your goal is to make the page look exactly the same to every user, then images is your only solution. However it's a poor solution as images take longer to load (and some may not load at all, rendering your page unreadable) and search engines index text, not images, so yoour pages become invisible to them.
A lot of people become overly concerned with making the page "perfect" for each visitor, when that's not what's most important. Good web design takes into account the difference between browsers and screen resolutions and browser window sizes and build a site that works for all of them. It's harder that way, but the results are most effective, even if not "perfect" for everybody.