I did this for compliance reasons (needed disk encryption and my CPU is too slow for full-disk), but it turned out to be really handy regardless. You can't turn

I did this for compliance reasons (needed disk encryption and my CPU is too slow for full-disk), but it turned out to be really handy regardless. You can't turn off fast user switching using X on Linux systems, but it hasn't been a problem for me; I just close my personal mail client.