I am in charge of a high volume, medium sized deis setup, and have been actively using deis since 0.2.0, but I don't have that kind of setup for my personal blog. It's overkill. Heroku is easier and allows me to get one with development, so I use Heroku.

It's not so much a "meh, I'd rather do git push heroku now than learn to setup elastic beanstalk/opsworks+docker/ec2+deis" than it is a "I just want to develop a quick idea without wasting time on ops".