If you hang around long enough, they think you're good. It's either my tenacity or stupidity - I'm not sure which.
There was a time when 'Batman' really kept me from getting some pretty good roles, and I was asked to do what I figured were important features. However, Batman was there, and very few people would take a chance on me walking onto the screen. And they'd be taking people away from the story.
Not to be able to move around or do things without thinking - that's tough. I may end up that way, but if I do, I hope to hell my intellect will take over, and I'll find some kind of joy and a way to contribute.