Dear edreaux:
Maybe you are using the feature "cavitiy", "circular pattern","linear pattern" , or "component pattern" in your model or assembly. These can be reflected in the drawings with respect to file size.
Here is something you can try that will decrease file size. With all other parts and all assemblies closed down (important), do a control Q, Then save under a new name, for example -XX. then close down the drawing or model. Then go into explorer find your new file, click on and re-name, take off the -XX then check the file size. It might be as small as 1/3 the size. You can then replace your old file with the smaller new file.
Solidworks keeps previews, and with all the previews, depending what is in your model the file sizes can grow large. You really don't need all these previews. Don't worry,it will save more.
eDrawings works with previews, so if you are making an e-drawing make sure to control Q first.
Best regards,
Plastserv