Thanks, excessive was my first thought too.

I let that happen exactly once before bringing it up to my supervisor. According to him, seems like it's at least across our dept (IT/software dev).

The history sounds like it didn't use to be an issue until they moved into a giant 'open office' with very few walls/rooms. What normally would've been a quick conversation in someone's office turns into booking a meeting room, and the mentality turns into, "Might as well invite XYZ too because now it's a meeting."

EDIT: typos and clarity