I am the GIS admin for a medium size city. In our engineering department I have a user (User 1) whose privileges are all setup correctly on the necessary feature datasets. Another user (User 2) was hired on who needs the exact same privileges on the same datasets. There isn't a tool to copy one user's permissions to another user.
The process I have to use is to check every dataset that User 1 has access to, check their permissions, write it down, and then manually assign those same permissions to User 2. One small help is to use the geoprocessing tool 'Change Privileges' where you can select multiple datasets and set a blanket 'view' or 'change' privilege on the datasets.
It would be great if there was a tool called 'Copy Privileges' where you could input a source user, then a destination user and it would then copy the dataset privileges from User 1 to User 2. Additional functionality that would be great is if after selecting the source user, the datasets the user already have could be displayed with the option to remove any that User 2 might not need. Additionally an option to overwrite or skip any privileges User 2 may already have. That would be great for users transferring from one department to another (water department to electrical or planning to engineering).