I'd strongly suggest that you learn to use PowerCli (if you don't use it already)
Using this, you can create connections to all three of your ESX hosts at once and issue pretty much any command that you would issue from within the GUI.
It may take a little getting used to - but what you learn will also stand you in good stead going forward, as the PowerCli skills are transferrable to normal PowerShell (well it is Powershell really . . .)
also, as stated above, AD authenticationon the newer versions of ESX will allow you to authenticate without manually typing a username / password each time you logon . .