When buying my lx2610 I asked the dealer about a block heater. The sales guy said starting their tractors sitting outside -30 snowing and blowing in the dead of winter he never had issues if glow plugged properly. He said only once did he have to glow plug a tractor twice.
I have a 200 yard horse shoe driveway. I used an arctic cat 700 tbx with efi to plow it. I have a trickle charger on it during winter it's in an old drafty farm shed. I let the fuel pump cycle through fire it up and let it idle/warm up while I shovel or snow blow doorways and never had a problem. If fired up, shift into gear, and throttle wide open I'd imagen it'd smoke, spit and sputter.
I guess it's personal preference and extra security. You don't want a dead/geled tractor when you need to clear the driveway to get to work.
I've seen more neighbors lose farm equipment and buildings due to block heaters. Could be a number of factors, bad electrical, bad extension cord, not heavy enough cord, or fault heater........I guess either way the heater did it's job.......