I was extremely lucky: my teacher preparation program started with team-teaching a summer school class, where I was observed for the full three hours everyday. The 45 hours of observation and 15 hours of feedback I received that summer is more than my colleagues who entered the profession through Teach for America or the NYC Teaching Fellows receive in the first five years of their career. Then, as a student teacher, my program limited me to teaching two classes so I could sound the rest of the day observing other teachers. These three factors have served as the foundation for my subsequent successes in the classroom.
I'm still paying for my Brown MAT. It was a great investment.