People that stacked Quicksilver
This app alone has made my workflow SO much faster. The interface feels a bit dated, but don't let that fool you. I've set up hotkeys so I can switch to any of my most used applications instantly with a keypress. It also makes it super quick to find and open browser bookmarks.
I use Quicksilver keyboard shortcuts (Triggers) to switch between apps. There is also a dope setting in “General -> Extras -> Hide other applications when switching applications.” This keeps your screen tidy by hiding other applications every time you switch to a new one.