I'd done this 3 times, and each time I enjoyed it very very much. I think it's one of the best kept secret of WDW, considering the price and amount of info given.
Make sure you put your name down first thing you get into Epcot. The tour is *very* popular and it's first come first serve. During busy times, it's completely booked by 11am.
As for the tour, interns took us into the green house, and explained to us how/ why things are being done there. And how inefficient that actually is in the regular real world. (I think she told us that only really dry countries would benefit from such schema, relative to the cost). My brother had 2 master degrees in Agriculture and he actually enjoyed it a lot too.
Definitely do it. Then go next door in the afternoon and do the ice cream social (another hidden gem).