I spent a little time cleaning up the garage today. I also decided to flip the tops of my workbenches over. As you can see, I routinely drill through parts directly into my bench (and frequently cleco parts to the bench). I also sometimes prime small parts by just laying them on a paper towel and shooting the primer, so the tops also had quite a bit of overspray on them. Here, you can see that the underside is pristine.
Some builders try to keep the tops of their benches pristine, but I consider these expendable surfaces. It’s only a few bucks in MDF to restore the top to new condition.