I'm also a developer whose workflow involves several different tools. One of those tools is Firefox, and I currently have several hundred tabs open in more than a dozen Firefox windows. I want to be able to instantaneously switch from Emacs to a specific Firefox window. I don't want to switch from Emacs to Firefox and then switch to a specific Firefox window (e.g., using Alt+`) like some desktop environments force their users to do.
The best solution I've found is to use a desktop environment or window manager that will display the Alt-Tab window list vertically with full titles displayed for all windows (which is similar to how I display tabs in Firefox using the Tree Style Tab extension). KDE and Openbox support this setup, and the last time I checked, Gnome didn't. So using Gnome would hurt my productivity.