If you know Tiger 10.4 or Leopard 10.5 Exposé, you might love it, and hate it on OS X newer than 10.5.
The first screen shot is OldExplse on Mountain Lion.
To enable OldExpose, open [System Preferences], select [Mission Control], and Uncheck [Group windows by application].
Comparing Exposés from Tiger 10.4/Leopard 10.5 to Lion 10.7/Lion 10.8, original Exposé (so called OldExpose) has been the best Exposé ever.
Disabling [Group windows by application] simulates OldExpose very well.
I let you easily select the target window from many windows opens, by preserving the original window places and sizes compared to others.
[Japanese version of this post]