We went to H&V for breakfast 2 years ago because our kids were 3 and 1, and they loved the Playhouse Disney characters. The food was very good when we went, we had no problems with this restaurant. We had an 8:05am ADR and were out by 8:45 (park opened at 9). I was the second person at the FP machine to get fastpasses for TSM. But, the CM outside the restaurant did not let us walk over to TSM until after RD. However, we were a few steps ahead of the rest of the crowd.
I wouldn't do a character breakfast just to get to TSM faster. We're not doing the H&V breakfast when we go next week because our kids just aren't into those characters anymore. We opted for lunch at Sci-Fi instead, as we believe they would love the chance to dine inside a car, and it looks like a great place to take an air-conditioned break for lunch. I'm still planning to get FPs for TSM first thing at RD.