The thing that makes Kidcot special is not just getting the global stamps from each country. My kids generally love it (even though they only color once and get stamps at every other country) because they get a chance to talk to the kids (young adults) from every country. They ask them questions about their favorite foods there, what they think of life in the US, what kids do for fun, etc. Often the students are really bored just having kids color and they really light up when people interact with them.
So I guess I don't really understand the concern about it being time consuming. I tend to think it is a waste of Epcot time to NOT interact with the representatives from other countries.