"Smarter than you" is a little provocative :D However, not false. Especially in the tech industry it's common to work with people, who excel in certain fields. I think it's empowering. Your goal as some sort of supervisor is to bundle these capabilities of your team and form it into something even better.
Also I think it's necessary to have really smart developers on your side, when your business operates in a highly competative or innovative environment.
When you find yourself managing a group of really smart and great people, be prepared to be challenged on a daily basis. And I think that's the beauty of it ;)