I don't think gurgling sounds alone are an indication that something is wrong. I don't have IBD or IBS, and my tummy makes a lot of noise. Especially after a meal, and if I lie down right after a meal. I think it's just normal sounds of digestion and peristalsis, and gas moving around inside. I make enough noise to be mistaken for a coffee maker sometimes.
One thing I've noticed though is that my husband's stomach (he has Crohn's) is usually quiet. But when he starts having tummy issues, there's some noise involved, and I think it maybe because of trapped gas in the digestive tract.
I have also heard that the gurgling sounds can be caused by strictures/narrowing in the digestive tract.
So, I don't think stomach noise in itself mean anything - even healthy people like me make a lot of noise. But if it is combined with pain, or cramping, or a change in the stool etc. I think it could be a sign of disease activity.
Husband with Crohn's
Diagnosed March 2003 Ulcerative Proctitis
Diagnosed March 2008 Crohn's & C-diff, hospitalized 45 days
Canasa, Lialda, Remicade, VSL#3, Florastor
In Remission since June 2008
Stopped vancomycin for c-diff Jan 1 2009
C-diff free, until Sep 2, 2009
Fighting c-diff, I guess for life