A couple things in favor of Dreamweaver.
One is that if a high-end corporate site is done on a wysiwyg editor - dollars to donuts it was done using Dreamweaver. Even intranet sites are moving away from FrontPage toward Macromedia products. I'm not saying that corporate America is always right, but it's never a bad thing to have their favorite tools on your resume.
Another factor is that Macromedia's vectorware is making them a favorite for "the next big internet thing."
Each software designer has a slightly different approach to UI (i.e., adobe loves task specific floating palettes, macromedia is obsessed with object property inspection.) Becoming familiar with DW trains your mind to Macromedia's paradigm - always good to know how to ride the type of horse that's likely to win.
Ditto with flash, fireworks and director...
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