Of all of the web editing products I have used throughout the years, Dreamweaver has had staying power.
I learned HTML way back when by fiddling with it in Netscape composer in WYSIWYG Mode and seeing what it produced, then reading docs and writing my own code.... then I wanted to do some more advanced stuff, so I switched to doing everything in Notepad, and eventually FrontPage 2003 because it was included with MS Office. (not anymore...imagine that)
When my company wanted to start making it so everyone could do web editing, we had to find a Window/Mac compatible program, there was GoLive and Dreamweaver. Adobe had already bought Macromedia so we could see GoLive being killed soon, and as much as I love Open Source, NVU/Kompozer/BlueGriffon/Seamonkey just aren't a choice because they screw up my hand-coded stuff, and Aptana often gets in the way of how I work. (I could probably get used to it if I used it for a few years) Quanta looked promising until it stopped being developed (Kate is OK), Bluefish is OK too, but it still feels more like a text editor than an HTML editor.
Even if you never touch Design mode, Dreamweaver does it right. Tag hinting, Auto-closing when you type / (though it would be nice if it highlighted matching braces and tags like PSPad does) TopStyle's CSS hinting, the ability to expand the tag library, DOM Hinting in JavaScript, an expandable/organized code snippet library, flexible templates, the ability to make a website editable with Contribute (which is handy for when non-technical types have to be able to update the site without screwing up the design) and everything a great Web development IDE should have, as well as the WYSIWYG editor.
At work, we have CS3, and are trying to get the board to move up to CS5 (more for our design staff), but here at home, I use Macromedia Studio 8. It installs and works perfectly under WINE, and with how I work (mostly in code, with some visits to design view), it works fine for coding HTML5. The only things I really miss from newer versions of Dreamweaver are things like built in CVS Support and improved testing/production server support.