Yes. I'm one of them, and I keep coming back to it. The short answer for why is that no matter what you think of it, GAE delivers on one basic promise: No ops/devops. I've scaled applications to thousands of QPS with teams of one or two people, and I never even had to adjust the # of instances (scaling is automatic). I've never had to worry about the database getting overloaded. It's just "write code and deploy".

Out of curiosity, what cloud provider interface do you think is better? Certainly not AWS. And which limitations do you consider so drastic?