Hey now, hang on. ALL of the Simpsons voice actors are incredible. Every single one of them. Why are you so astounded by the attention to "Dan C(???)" He's incredible! ALL of them are, and Kavner most definitely included. "Lisa's Voice" is the amazing Yeardley Smith, for future reference.
She does incredible work and so do the rest of them. If she wanted more attention, believe238 me, she would get it at her whim. She's plays only the most well-known TV mother on planet Earth.
I, for one, am really suprised that more people weren't really happy to see the reception the Simpsons cast got from that audience when they took the stage. I've never seen a more moving and rousing ovation for any other guest
on that show, and that's saying something.
I remember when The Simpsons was just an upstart TV show and what some people thought of as The Flavor of the Week, and not the Beatles of America that they are now. It was b68clear then that they were the best show on TV even though they didn't really get the credit for it.
Now, they're appropriately revered, and Simpsons fans should be very pleased about that.

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Good point, I was half asleep at the time.
I think someone is trying to sell me something

Hard to say what happened on Inside the Actor Studio. Kavner might have been asked more questions, but the shows editors chose not include them. Maybe she wasn't feeling well. Maybe she does not like doing the voices in public. I personally was disappointed that the show turned into live version of doing Simpsons characters and one liners.