Yeah, you get used to it. I'm not even nervous at tournaments anymore. I just play my game and chill. And I'm sure there were a lot of Vergils there. Doesn't surprise me at all.
If you had Dorm backed by Hulk, the most effective way I can see to beat to that team is really just to stay on top of them. Yeah, you've got the "Get off me!" assist (I guess), but that really doesn't profit you for too long, because a good rushdown character backed by a good rushdown-aiding assist is absolute hell for Dormammu. I can tell you this though: If you could keep someone at like...3/4 screen that whole match, you've definitely got it won. That's probably where Dorm is strongest, at least in my opinion. Fair warning though, I would probably just EX Seismo through all that nonsense.