I've tried tiling window managers multiple times, and each time find issues with them that frustrate me until I switch back to Gnome:

- No simple way to keep a small IM status window open in the corner of a workspace

- Limited support for resolution-dependent windows, such as videos, games or remote desktops

- No notification bar for status apps to utilize, such as pidgin or network-manager

- No integration with modern desktop environment features or tools, such as media keys for rhythmbox, launchers like gnome-do, network-manager, automatic disk mounting, screen lock, etc

Gnome and compiz have solved a lot of problems that actually make a Linux desktop usable in modern contexts.