I was put on methotrexate just after I was diagnosed when I was 15 so I've been on it 7 years, I didn't respond to steroid treatment and was allergic to pentasa and as I also had arthritis methotrexate was the best (and at the time last) option for me. It dramatically improved my crohn's and arthritis and I was able to return to school and start being a teen again, a few months later remicade became available in the UK and I was given one dose of that which put me in full remission and after that was only on the weekly 25mg tablets of methotrexate which kept me in complete remission for 2 years (I flared as they decided to take me off the methotrexate and go drug free as I'd been inr emission so long) so went back on the methotrexate and got another 3 years remission until a year ago when I had malabsorption issues and got ill again (it took them 6 months to twig it was malabsorption and switched me to methotrexate injections) but now I'm on the injections I've been in remission for 6 months and so far still good!
Its definitely worth trying the methotrexate, with the tablet form I got really bad nausea and light-headedness for about 12 hours after taking it so I'd take it before bed to sleep through most of it and if I was still nauseas I found prochlorperazine worked brilliantly. With the injections I also take them at night but haven't noticed any side-effects anyway, the injections are supposed to cause less side-effects than the tablets as you don't digest them.
Remicade is a scary drug, I'm given it episodically so I only have one dose when I flare and don't get given it regularly, it is an absolutely fantastic drug though - to think just one infusion helped boost my methotrexate so I lived completely symptom free for most of my school years so don't write it off just yet but hopefully the methotrexate will be enough to help.