I personally have an instance that I call my "UTILITY" instance. I use this instance as my CMS. It's also where I store all my monitoring databases like Spotlight, utility databases like ClearTrace and most importantly - my central DBADB. I have a DBADB in every instance I administer. It's a place to keep all your DBA related scripts and tables (maintenance logging tables, sp_BlitzCache output, harvested wait stat data, etc.) and you can have peace of mind that nobody else is going to go in there and mess with them. I then created a publication on my DBADB, selected only the stored procedures that I want to deploy and set up subscriptions to all the target instances. With just a few clicks of the mouse, I was able to deploy out the latest and greatest version of all my administrative scripts.
These are the ones I personally replicate out - if you have other useful scripts, feel free to share!