I had pretty much the same experience as amy, I had about 10" removed and started experiencing symptoms after 2 or 3 months similar to what I had before surgery. Unfortunately my Crohns came back almost immediately, maybe not with the same intensity but it came back regardless.
32 yr old male
Diagnosed with Crohns in 1994 (lower bowel/ileum)
Medication history: prednisone, azacol, sulfasalazine, cipro
Current Medications: entocourt (periodically-as needed), Remicaid, flagyl
Surgeries: 2002 (remove fistula), 2004 (6" of ileum removed)