Where I work, we're around 30 programmers, plus another 100 or so doing gfx, sound and other stuff.
We're using a semi-agile model for our development. Plans have been drawn up ahead of time, but they are continuously revised and evaluated as work progresses. We've basically picked some parts of agile, and dropped others and are continously evaluating taking more parts into our methodology.
Our budget is in the multi-million dollar range, and we've been working on our product for several years now.. If that doesn't count as enterprise, then what does?