@Ol'Lady
I think they usually had other extracurriculars in addition to a year or two work experience.
How much direct patient contact you get as an MLS depends on whether you actually work in the field or apply right out of school. It's also a function of where you work. In my clinical rotations at a small hospital, I did phlebotomy and was out interacting with patients regularly. Where I currently work, I have no patient interaction unless someone is lost and I'm helping them figure out how to get where they're trying to go. So depending on which of those backgrounds you're coming from, you might have different needs for more or less other patient contact.
You should probably still shadow docs outside of pathology, as people who aren't familiar with pathology (and that includes a lot of non-pathology docs) tend to stereotype and might think you're weird if you only shadowed pathologists/want to be one, lol. No matter how cool pathology is. Make sure you have a good feel for how things work outside the lab.
Make sure you find multiple areas of medicine appealing before you apply.
Some kind of volunteering/community service is desirable. If you've already got sufficient exposure to patients and a hospital setting, then volunteering doesn't need to be medical, could be mentoring or something.