Are you comparing the web gui to the command line, or Ansible to fabric? It feels like you're conflating two different things there.
I can't speak for the UI, but I use Ansible to deploy everything. It's been a joy and a lifesaver. I just used it to provision a new server (from zero to full Django stack) in 30 seconds. Fabric will accomplish the same things, but Ansible is much more elegant and terse (by a lot). I definitely, definitely recommend it.
For the UI, we use either ansible-pull or http://www.getinstabot.com, which is a chat room assistant I'm working on in my spare time. Being able to say "instabot deploy feature/discounts to staging2" and have the code running there in ten seconds is fantastic, and only possible thanks to Ansible.
I can't speak for the UI, but I use Ansible to deploy everything. It's been a joy and a lifesaver. I just used it to provision a new server (from zero to full Django stack) in 30 seconds. Fabric will accomplish the same things, but Ansible is much more elegant and terse (by a lot). I definitely, definitely recommend it.
For the UI, we use either ansible-pull or http://www.getinstabot.com, which is a chat room assistant I'm working on in my spare time. Being able to say "instabot deploy feature/discounts to staging2" and have the code running there in ten seconds is fantastic, and only possible thanks to Ansible.