How important is EZSteer feature in a Snow Thrower?
A big snowblower can be a lot to horse around in the snow, with slippery conditions underfoot. Remember, you will be turning the thing around at the end of each pass. So much depends on how strong are you, and how heavy is the snowblower.

Even with my little 24 inch Toro, at times it can take some effort to drag it around after I've done 150 feet of driveway, plus a turn around area, plus my neighbor's driveway. Admittedly, I only use the snowblower when the snow is too deep/heavy for the tractor to push, so when I do need to use the snowblower, it is a heavy day for snow.

Is it worth the extra money? That depends on you, the depth of your pockets, etc. I definitely suggest trying it out. Can you turn it easily enough? Don't forget that you will need to do so outside in the blowing snow, multiple times. A little exercise is a good thing of course.