One special event I would HIGHLY recommend is the Tomorrowland Terrace Dessert Fireworks Party. The cost is around $31.00 for adults and IMHO is well worth the cost. It is held at the TT on certain evenings just before the fireworks start (which depends on what time of year you are there).
You sit on the lower level at assigned tables and help yourself to all the dessert goodies they have available--and believe me--thay have TONS of delicious desserts just waiting for you. The chocolate dipped large strawberries and the creme brule are my favorites, but there are lots of other goodies available.
You finish eating at about the time for the fireworks and can watch from where you are without the crowd-crunch. If you are VERY lucky, Tink may fly right over your head!! She did this past February!
We ALWAYS include this special event in every trip we take to WDW. Non-alcoholic drinks and the tip are included in the price.
"If you're at all into gardening, take the Behind the Seeds Tour at Epcot's The Land pavilion. It's fairly inexpensive by Disney standards; I think it was less than $20 per person last fall but don't recall the exact price. Hubby is a gardener and thoroughly enjoyed the tour; I'm not much of a gardener, but I also found it interesting." Catcrazyperson is correct--the Behind the Seeds Tour is well worth the money AND is cheap by Disney standards.
mrhub: so much depends on who your expert is for the lunch/dinner experience and they are all volunteers. This past February I thorougly enjoyed both of our dinner with and lunch with. The dinner was with an imagineer (Robert Sias--the manager of sponsor integration) at Flying Fish. It was supposed to last about 1 1/2 hours--we were still there 3 hours later! He is the manager of the team that decides how to integrate the corporate sponsors into the Disney experience. Fascinating--and NOT in any book I've found.
The other experience was lunch with an animal handler from the savannas at Animal Kingdom Lodge. It was held at Sanaa. It also was very interesting and not something you would already know.
I would do either of them again and heartily recommend both!
Patti 
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