I have experience in the opposite direction and now have only 120cm of small intestine to show for moving up the ladder.
Diagnosed in 1997
Pentasa, Flagyl, Prednisone prior to surgery in 1999
Pentasa, Cipro, 6-mp and maybe a year of Remicade (worked for me, but too much damage already done and scar tissue present) prior to surgery in 2003
6-mp prior to surgery <3 weeks ago. Now off all meds waiting to finish healing before starting Humira, which I'm hoping will work for me. I can't afford to lose any more guts!
I think from my viewpoint, if what you are doing is working, stick with it!