I don't understand why everyone is talking about Cmd+Tab. If you're on OS X, you use Mission Control with a trackpad or a mouse. People coming from Windows who refuse to adapt to using Mission Control, and instead rely on Cmd+Tab like a Windows user that has no other option is sorely missing out.

The old Exposé was a hindrance due to lack of proper multi-monitor support. Honestly it was a disaster and mostly unusable. As of a couple versions ago, multi-monitor has worked flawlessly. Mission Control has become indispensable to my daily workflow. Aside from a proper terminal with tools like ssh (seriously, fuck cygwin or Putty as replacements), Mission Control is the reason why OS X is amazing to me, and I can't stand to use Windows which lacks any kind of proper window management. Alt+Tab and Win+Tab on Windows are a joke, and all of the third-party software packages that try to hack on multi-desktop, multi-monitor functionality are a mere shadow of a native implementation. Last time I was forced onto a Windows machine at work, Dexpot was the only software that was even remotely bearable to use, and even then required binding mouse gestures via an additional third-party tool.

If you are reading this and using Cmd+Tab on OS X, do yourself a favor and spend some time retraining yourself to use Mission Control. It will save you so much time hammering the Tab key.