Re: List of users who uses Bex Query.

you can use standard tct_mc01_q0200 report to display statistics usage of all reports.

(or) you can create a copy of this query and just keep Date, user and Query in rows followed by counter of queries in column. 

you can put a variable on date to choose a free date (or) you can use current /previous date statistics. you can modify it as per your requirement.

Note: in user column, you can exclude your user id.