I recently downloaded and installed Wordpress 2.0 (stable version not released, yet) from wp's subversion repository... and I didn't have regrets about the upgrade. Wordpress has gotten better, with TinyMCE now coming *with it* by default, some nice changes with theme admin page and the "Compose" or "Write Post" page in the Admin panel.

There is now a feature to allow uploading images (for inline use) on the "Write Post" page itself. This is something that I guess most wp-users were looking forward to (as was with WYSIWYG editor for composer).
Like the newest drupal version, the meta options for each post now uses javascript to hide by default. This lessens the length and makes less confusing the composing page.

Theme list ("Presentation" on the admin panel) now sports thumbnails of the themes.

The plugins section now sports new plugin by name 'akismet'. The plugin is supposed to be a 'spam killer' that makes use of a WordPress.com API key. To get a key one has to register on Wordpress.com (apparently for another blog there) - and you get an email with 12 letter password which is your API key. Somehow, the one that was mailed to me never worked and I was forced to disable the plugin. The idea of Akismet itself is a cool one, given the large amount of spam that is thrown on wordpress blogs each day.

Overall, WordPress 2.0 - as far as the usage is concerned - would be a better experience than the previous version.