I just recently went to Mayo for the first time. I was referred by my GI because I've been having a hard time finding a medication that works and that doesn't cause bad side effects. I saw Dr. Loftus, but most of my time was with the GI fellow (can't remember his name at the moment, but he was great). They actually did listen, and instead of telling me to tolerate the side effects I get from Remicade/Humira (40+lb weight gain, severe acne, hair loss, migraines every 4-5 days) they brainstormed to come up with treatment options. I was in the MD clinic for almost 2 hours talking to the doctors, and I was blown away that they took that much time to listen!
It kind of felt like medical summer camp- saw the doctors in the morning, and then got a schedule of events for the day- bloodwork at 10:45, Xrays at 11:15, MRI at 1:30, etc, etc. It's a very efficient system and every nurse, tech, and other staff members were great. I'm going back next week for a colonoscopy w/sedation and then meeting with the doctors a few days later to make a treatment plan.
Ask your regular GI if you can go to Mayo for a second opinion- they will send your medical records to Mayo and then a doctor there reviews them and "accepts" you to be seen in the clinic. It can't hurt to try.