Johnson feels he's getting back to his best ahead of their clash with Fulham.
Johnson said: "I like having responsibility within the team.
"That is what I had at Middlesbrough as well, but when I went to City it was a case if I didn't do it then there were another 10 top-class players who could do it on the day, so there was no pressure on one or two individuals.
"This is why I came to Sunderland. I want that responsibility.
"I want to be a big player here and have an important involvement in matches."