So my favorite console on OS X is iTerm2. When I’m working with multiple servers, one of the most useful features is “Broadcast Input” (BI).
BI lets you type into one terminal session, but send those keystrokes to more than one session. This can be all of the tabs in the iTerm window, all of the panels in one tab, or some of the panels across multiple tabs. This is both a very powerful feature, in that it can allow you to configure many servers at the same time, and very dangerous in that it can allow you to inadvertently destroy many servers at the same time.
With great power… Moving on.