I agree with all of the other posters who have suggested that you find out more about the program and go observe. You seem to have some preconceived notions that may or may not be true.

I've had three kids go through regular kindergarten before moving to gt classrooms. Only one seemed bored and miserable in kindergarten. The gt class wasn't necessarily more work, it was different work at that was more at their level. All three of them found the gt classes to be a relief of sorts, particularly in math (their strength area). Even though they all skipped a year of math going into the program, none of them felt like they had missed anything. I still remember one of my kids looking at me and asking what they would have done in first grade math. When I responded that you spend a lot of time "making ten" and playing simple math games, she thanked me for not making her suffer through such boring math.