I have dissected before when in graduate school, and I must say that dissection is a very important part of learning the anatomy.  Particularly, if you see surgery in your future, I believe dissection is imperative.  Though the body is preserved, and obviously not fresh, getting the feel of actually running a scalpel through tissue, is not an exercise to perform first on a "live" patient/person.  Also, dissection allows you to truly appreciate the proximities and functions of soft/bony tissue, vascular and neural tissue.  I agree that it is demanding to dissect and learn with a rigorous schedule, but anatomy is the basis of medical science.  Personally, the prosection was a turn off for me at LECOM-B.  If you have the opportunity to dissect, I certainly would not pass it up.
My understanding is that for you to dissect at LECOM-B, you also have to apply for that position despite making the grade.  Is this correct?