I'll echo Lisa ... so much depends on your congregation and the make up of people/personalities/leadership style there. I happen to have been in 4 churches in the last 4 years ... all have viewed the curriculum writing as my job. Some teachers have offered their own spin on the lessons, or offered their own enhancements. Others have been grateful to have very detailed plans to stick with.
I'm currently part time in 2 churches. The leadership in both has been very trusting and hands off ... I do the writing and get the curriculum to teachers a week or two before a new rotation is to start. IN both churches (small to moderate size), we have a pretty stable base of folks that participate from rotation to rotation, so I'm not having to do orientation work each time. I have also been in a rather large church here with a mega budget ... their organizing team (before my time) opted to buy some rather expensive curriculum as the basis for their rotations ... it then was my job to "tweak" it to fit their unique needs. Teachers changed every rotation there, so I had to get curriculum ready and orient them a bit earlier (but not much).
I have also made it a practice to have everythign ready for teachers so all they have to do is come in and teach ... they don't have to spend time (and money) tracking down supplies.
Good luck and blessings on your efforts!
Exchange Volunteer corrected spelling (so that meaning is now clear).