Both lectures AND PBL sessions may be led by MDs or PhDs, to my knowledge. Therefore, you can (and will) get MD contact in both PBL and non-PBL curricula.
Also, you may want to search this forum to learn more, but PBL isn't all happy sunshine and rainbows of "interactive learning with faculty" - it requires research on your own time with often ill-defined objectives, and it may not be the most time-efficient method of learning for all students. Some people like the time/initiative required for PBL, while many students would prefer to have an organized curriculum present the information that is important to learn.
That being said, I am sure that most non-PBL schools (including my own) have some small group components. For instance, at least once a week, we have some sort of small-group problem solving or discussion session involving clinical cases (with MD or PhD faculty, it depends).
For more information on what kind of emphases each school's curriculum has, try checking school websites or the Medical School Admissions Requirements (MSAR) book.