second on beanstalk/docker - beanstalk does simplify quite a bit about running a fleet of docker images (and non-docker stuff too), uses standard aws tools (cf, elb, rds, ecs, vpc), has zero downtime deployment built in, automated server upgrades, app monitoring, environment cloning etc...

one nick against beanstalk is that it could be faster doing all those things, but it's tolerable considering alternatives.