"He's the head coach, so, what do they say? 'It's good to be king,'" Miller said.
Miller has been on Arizona's staff since Whisenhunt took over in 2007, the first two years as wide receivers coach and the last two as passing game coordinator. Miller said he would like the full reins of the Cardinals' playbook as offensive coordinator, but he called his new duty "an evolving thing."
Whisenhunt told the team's website that he also considered assistant head coach/offensive line coach Russ Grimm for the job but ultimately decided "it was not time" for him to take the next step. Grimm agreed with the assessment, according to Whisenhunt.
Whisenhunt's other coaching moves this offseason came on the defensive side, with Ray Horton hired as coordinator, Louie Cioffi as defensive backs coach and Deshea Townsend as assistant defensive backs coach.
Whisenhunt hopes the staff overhaul helps spin the team away from its disappointing 6-10 finish in 2010.
"I can tell you how great of a guy Ray is or the job Mike is going to do or a lot of different things," Whisenhunt said. "But what it ultimately comes down to is we have to perform better on Sundays than we did last year."
The Associated Press contributed to this report.