Wordpress is growing popular, but at the cost of losing quality developers. Simply because its codebase has become horrible, memory-heavy and bloated. I understand Wordpress gives you the tools to build a CMS portal, etc. But it doesn't do one thing very well and tries to do multiple things pretty averagely. For example (this has been cited before) implementing pagination on the posts page and pages themselves is horrendous.
After being with Wordpress for more than 4 years now, I am now frustrated and recommend my clients anything but Wordpress.
It was cool and helpful, but over the years, it's codebase quality has drastically reduced. If you ran CMS'es based off wordpress, I have nothing but sorry feelings for you; simply because I ran one too.
Now, my new favorite isn't blogger or tumblr, but rather:
rails generate scaffold Post title:string content:text