I'm w/Mike since I am one w/mild Crohn's disease. HOWEVER, if I were struggling w/fistulas and abscesses I'd sure be ready to get aggressive FAST! Or if I were having LOTS of pain and partial obstructions and wasn't responding QUICKLY to steroids and able to taper off them pretty quick w/the aid of mesalamine and Imuran I'd be willing to get aggressive fast too.
I tend to be rather conservative when it comes to medications so would always want to try the less "controversial" or proven meds first, but if I didn't respond quickly and couldn't QUICKLY taper off steroids - well, quality of life is more important to me than quantity. I'd jump at the newer meds like Remicade, etc. in a heartbeat.