Please, stop. This EXCITEMENT you cannot apply as a Golden rule. You can use it for junior position, may be junior to senior transitions but there is no sane professional with EXPERIENCE and EXPERTISE that will communicate and show excitement in a natural way. It is not logical.
When you have 20+ career, filled with success and failures, from which you can learn how to see and seek BALANCE, the last thing on your mind is excitement. You tend to see the world with realistic and moderate lens. And this is not only good for companies, this is a golden opportunity.
Sadly, more and more I look at the startups as a kindergarten party with serious consequences. Some VC's are playing the game and some lucky kids are taking this as a validation for knowledge and expertise. Selecting teams with "cultural fit" and "excitement" to fulfill a hollow visions of "changing the world".
P.S.
I don't feel excitement. I consider myself a craftsman with a passion and deep love for my work. And your way of thinking is positioning you in the group of "thank you for your time" crowd. Automatically.