Hi David:
I think many teachers assume that using an approved curriculum along with textbooks and related resources they will be meeting the needs of the student. Actually, this would be better described as "curriculum-based", or even "institutional-based" learning system because the apparent focus is on meeting these needs, rather than the students.
Of course we need solid curriculum with course objectives, student learning outcomes, assessments, and appropriate resources to teach our classes. Student-centered shifts the focus to what the student needs and how we can best provide that. Being creative with how objectives are covered is a good start, if that helps the students learn. A simple way of looking at it is "Am I teaching well", vs "Is the student learning?" Of course, the latter is what we want to achieve.
Regards, Barry