Ryan:
To answer your question of how many fairways can you find which don't require any grading, I thought I would go back and look at a handful of my own courses. Here are the details for five of them:
High Pointe: fairway was regraded on #1 landing area (using fill from pond), #10 (crest of hill in l.a.), #12 (for visibility to l.a.), and #18 (fill landing area). Left alone 10/14.
Stonewall (Old): fairways reworked on #1, 2, 3, 4, 8, 10, 11, 13, 14, and 18. (What can I say? It's the Fazio routing.)
Pacific Dunes: fairways graded on #1 (soften sharp contours at crest), #2 (slight change for visibility), #4 and 12 (sand cap, no real contour changes), #9 (improve visibility at top of hill), #13 (soften slopes), #18 (fill in behind big bunker). Left alone 6/13.
St. Andrews Beach: only changes at 13 and 15. Left alone 12/14.
Stone Eagle: there's hardly a spot in any fairway that is untouched ... a little portion of #2 and #8 and the saddle on #6 and the landing area on #18.