Really? Do you work on your own car? Is it because you think you aren't smart enough to do it or because you think that spending your time on other efforts is a more valuable configuration?

AWS is the electric company. Heroku tends to be the circuitry, outlets and light switches for your house. You may take it for granted because it looks so simple, but it's the simplicity that makes it great.

As PaaS providers begin to mature and turn attention to more worthy challenges (like geo-agnostic deployments, easier scaling, for example), then their value is only going to increase.