You ask "what else besides writing code or managing people" and mention prototyping & creativity: have you considered moving into product design/UX or product management?

After working as a developer for a few years, I got a bit disillusioned with "building and fixing things all day" as you say. I now work as a User Experience architect and am still involved with building and fixing things, but in a very different way. I still write code, but mostly to prototype ideas and collaborate with developers.

A broad understanding of various technologies and lack of specialisation/investment in particular frameworks is a plus, as you can understand what's required, without getting bogged down in details. You can take a leading role, without having to be anyone's boss.

Not sure if this sounds attractive to you, but it works for me :)