mihosrce To answer the title: No, Wurst commands are not visible to other players as Wurst commands are client-side. What gets announced to admins is the actual game mode change, not anything that Wurst is doing.
mihosrce Is there any way to switch to Creative while having OP without it announcing anything in chat or notifying other players?
Yes, this is controlled by the log_admin_commands game rule. So you can do:
/gamerule log_admin_commands false
BUT, that is itself an admin command which will be broadcast to other admins. Also, turning off this gamerule only turns off the notifications in chat. It will still show up in the server console/logs, so any admin watching the console will still see your game mode change.
