Useability of ALT-TAB

I really like the tabbed browsing metaphor that FireFox pioneered/popularized. But. I also like the useability of ALT-TAB. I don' t know how much is key size and placement and how much is nearly two decades of practiced manual dexterity, but I find ALT-TAB to be invaluable for toggling between windows (as in cut-and-paste scenarios). I just haven't trained my fingers to do CTRL-TAB. Plus the fact that it enumerates through all tabs in the FireFox instance, rather than toggling.