Thanks. I figured out a makeshift method...most of the lines are coming from one class, so I'm selecting all the polylines in that class, decomposing, then selecting the resulting arcs and grouping them. inside the group, I can see where the giant lines are stemming from, and you're right, it's usually arcs. So, I'm just deleting the stem arc, and the big line goes away. WOOHOO! now I just have to find all of those little annoying arcs.
It's a restoration, and all of my posts on this message board have been about drawings related to this church...I should have made the drawings less detailed to begin with.