I don't turn mine off in day to day conmuting, as I don't feel like it should be. I don't know you guys, but my car is used as a daily driver, and doesn't need the TC off.
Is not too intrusive, it's predictable (you know when is going to kick in and how would thae car react), and if you find some problem on the road, going 80 miles an hour, I bet you don't want the car to go sideways, and for sure is going to react 100 times better is those situations you don't expect, even if you were Mr. Ragnotti. It's a computer, and thinks faster than us.
Is controlled situations is another matter. On track, I've seen differences of 2-3 seconds per lap, as when going really fast, the TC doesn't know how to react. And the hazard lights keep coming on when you brake hard (really anoying).
Although, the car w/o the TC reacts like it has disconnected only part of the TC, but it could be just the cahssis, that it behaves that well, but I always had that feeling.
Everyone can do with their cars whatever they want, but my advice is to keep TC on unless you are going to be fast and you are prepared for the reactions of the car.