Hi, Cindy,
We do use Godly Play with our 2, 3, and 4 year olds. It's not a part of rotation, but it meets the needs of having this age group stay in one location. And also I think it's just perfect for them. This will be our 5th year of Godly Play, and no one is ready for a break yet.

We have a music person who gathers the children in the story circle every week, and then we actually ROTATE (yikes) other adult leaders. The storytellers and the doorkeepers volunteer in teams of 2 and serve one Sunday each month. Our Godly Play takes place during our worship service (after the children leave) so it's much easier to get volunteers for once a month than to miss worship over a prolonged period. Having the music leader be the same (a staff person) every week makes this possible. She doesn't necessarily stay for the whole session, but may return to worship after the children have gotten to know their other leaders (all of whom are parents and have volunteered at least 3 of the 5 years!).

We find that doing rotation for children this young means a lot (too much?) of revision for age-appropriate activities, unless we are able to incorporate them into a broadly graded group. We do the broadly graded thing in the summer. The older students love being leaders for the younger ones who are also delighted with the arrangement.

Let me know if there are other specifics for Godly Play you need.
Anne