Seems like your GI has actually done the right thing.
'Mild' Crohn's is relative. Because you're so new to Crohn's it's impossible to know whether you have a genuinely mild case that always stays mild, or early/new disease which will get worse over time. Thus your GI is covering his bases and he's probably right to do so. That said, what you're on is pretty normal for Crohn's. You're not on the strongest meds yet, which are the biologics.
Entocort is a relatively safe steroid. It's topical, which means it works only on the gut lining and doesn't get into the bloodstream - at least in theory. A small amount of it does get into the bloodstream, but it's a lot safer than a systemic steroid like prednisone which basically affects every system in your body. On a 6-week course you shouldn't gain weight, get a moon face, develop steroid dependency and all the other lovely side-effects of more systemic steroids. (Actually even a 6-week course of prednisone shouldn't cause those issues, but some people develop side-effects much more quickly than other people do.)
Good luck! Glad you've got a GI doctor who seems to be on the ball and keeping an eye on things from the start.
Dx Crohn's in June 2000. (Yay )
Tried: 5-ASAs, azathioprine, 6MP, Remicade, methotrexate, Humira, diets.
1st surgery 20/2/13 - subtotal colectomy with end ileostomy.
2nd surgery 10/7/15 - ileorectal anastomosis. Stoma reversed and ileum connected to the rectum.
Current status: Chronic flare. Do I have any other kind?
Current meds: 50mg 6MP; Entyvio (started 3/11/16)