The new dock is cool, in all it's reflective glory, but...

You can't really see what's open without doing an impression of a farsighted geriatric.

SQUINTING. SUCKS.

So, if you'd like to go back to a more classic Dock, try typing this into Terminal:

defaults write com.apple.dock no-glass -boolean YES
----Then, type this:
killall Dock

And you'll have a Dock that doesn't mess with your eyes!
If you should ever want to go back, try NO instead of YES in that first line.