I am a big fan of a block heater also... as stated, it's warm as soon as you start up, you have heat, and you're close to operating temp, not FREEZIN' COLD like the rest of the truck. If I don't plug in my trucks, I'm still waiting for the heater to warm me up when I get to work 30 mins later....
I haven't looked, I hope my new truck ('00 F350) has a block heater... I'll check when I get a chance, if not I'll be puttin' one in...