In reply to goldmember:
I love it. Similar to you, I could never feel the value in shifting things from the in tray to the out tray - not to say there isn't, but I didn't gain satisfaction from being a cog in a machine. I work as a Project Engineer for National Grid, with my projects being replacement of ageing HV system assets and installation of all new HV assets as a means of extending/reinforcing the HV network. My involvement in project cycles is typically 2-4 years for medium sized projects and I see them from high-level design, to development, to pricing/tender/contract award, and then work with contractors through detailed design, installation and close-out. I can have anything from 1-5 on the go, dependent on workflow and it can be a lot of responsibility, but ultimately satisfying to see something from a paragraph on a Word document to a physical installation being commissioned.
I went through a National Grid training programme, so quite specific and possibly not much help, dependent on your background/qualifications, but I can't see myself outside of project-based work now.