I tried searching for the usage of a specific macro in our Confluence Cloud instance using "macroName=<macro>". Confluence Cloud returned a large list of results, most of which weren't using the macro. I thought my search string was false, did some investigation but couldn't quite get it to work. At some point I started thinking: Hey, maybe it's another one of those things that no longer works in Confluence Cloud and there's a ticket originally reported as Bug 5 years ago and Atlassian turned it into a Feature Request and then closed it and the product manager resigned and it'll never be fixed, etc. The usual process.
And here's the ticket! YAY! 
We are developing documentation for users, and it looks like I have to open and view hundreds of pages today to find what macros have been used. A search for macros is a basic feature, please implement it.