One should read the post title before replying.
No, not all on all sites. I always, without any exception, install WP-Serverinfo, Client Status and Advanced Automatic Updates. Almost always AIOSEO, TinyMCE Advanced and .... oops, I reached 5 again
WP-Serverinfo gives me PHP version, memory, extensions loaded, file upload restrictions and more. I need that to be able to give diagnose when something is not right. And when people invite me to their site there is almost always something broken.
Advanced Automatic Updates ensures their plugins are always updated. I don't have the time to update for others, and the owners either haven't the time either, or don't care or dont' understand.
Client Status gives me a tool manage nearly 40 sites using an hour or two weekly, giving me their uptime, update status, pending comments and more, nicely lined up in a table. This plugin seems to be abandoned, so I have made some local, not shared yet, modfications for it to run on PHP > 5.3.