The largest project I've worked on in the last few years was Gollum, which was quite large but not AAA-scale large. Collecting names for the credits was a major concern, both in the sense that it was a challenge, and in the sense that it was important to the company. Hard to believe, but sometimes a subcontractor simply doesn't know who should be credited from their side.
(and don't get me started about administrative staff who insert themselves everywhere even if they worked on something else)