Thank you David....and I did just find this from the CarTalk guys too:

Ray: And I've never seen a recommendation from Chevy that calls for transmission service every 25,000 miles under normal conditions. That may be this particular Aamco shop's recommendation, because they'll make four times as much money if you do it that often. But I think the guy's wrong on that account.

Tom: This guy is also perpetuating the myth that "disturbing" an older transmission will somehow cause irreversible problems (this is also known as the "let sleeping transmissions lie" theory). This myth is based on the belief that the transmission has gotten used to its old, dirty fluid. And if you drain out that loving, old, comfortable, familiar fluid and introduce new, clean, uncaring, unfamiliar fluid, the transmission will be upset and won't remember how to work right. This, of course, is complete horse-droppings. A transmission fluid and filter change is never harmful, no matter how many zillions of miles you have on the car or how many fish scales you have in there.