I love Heroku and use it for everything, but I'd seriously reconsider AWS for some of my bigger apps if I could just get Elastic Beanstalk for Rack apps. Frankly, I'm shocked that this hasn't been released yet.

I'm an apps guy, not devops, and definitely not ops. I can manage an AWS deployment if I have to, but it's not on my top ten list of activities that I consider to be fun.