I have to admit people with big plans put me off. Not that I'm not impressed, but I have the feeling that they'll never be able to deliver the plan. And that often proves true.
On the contrary, I'm very interested in people with clever tricks, able to make a simple plan or summarise a situation without loosing track of what's essential.
Often complexity can be simplified and that would be a mistake to start working on a project that hasn't yet been made small... as the risk of failure would be quite high after people get lost along the way and become counter productive.
As the project goes on, complexity will increase with the size of the project and more resources will have to be pulled in. That's when viewing big is necessary to leverage growth and keep the momentum, not so much at the beginning.