All the drudgery.
I almost find it offensive when colleagues open a MR with an obvious slop description that's frequently inaccurate.
That said, I find AI useful for a lot of drudgery like resolving merge conflicts or splitting changes out into separate MRs.
Particularly with the latter I had issues with small models, they butchered the changes I wanted moved. Not even on the second attempt did GPT 5.4 mini manage to move 10-20 lines to another file without modifying them in the process.