Hi,
recently I've collected info on the usage of Bugzilla by Wikimedia's development teams, listing each team's * Bugzilla components (projects), * bug tracking and development planning tools, * criticism and wishes about Bugzilla specifically, * use of Bugzilla's "Priority" field.
There are still many blank fields and it's work in progress. I'm sharing it here as it might be useful for others, plus you are of course welcome to correct or add any data:
https://www.mediawiki.org/wiki/Bug_management/Development_teams_usage
andre