Yes, that probably a lot of people think sadly. It originally was made for photos/images only and then has been extended. Since it is quite known in its niche already we chose not to rename it. Never change an already known "brand name" unless your really must. On social networks we use "ZenphotoCMS"). Besides some of the other names are already taken if I recall right.
For that reason we use the claim the "The simpler media website CMS" additionally and feature its capabilities for multimedia, blog and pages right on the front page.