It sounds like the DXF file you are working with has exported "lines" instead of "faces". You can open the DXF file in a text editor and you'll probably see a lot of "LINE" entities in the file.
I don't know of a good workaround for this other than what you're doing - I'm not terribly familiar with the DXF format, but it looks like assigning surfaces (versus line surfaces) will be a manual process for such models...
If you cannot get another version of the file that uses Faces, or if no one else has better suggestions, these functions may help speed up your workflow:
Vertex -> Create 2D Mesh
Vertex -> Create Convex Surface/Object
These functions may or may not help depending on your geometry, of course...
Good luck,
Dennis
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