Nope, that was someone else. Snowblowers have long handles, when you stand further forward behind them you are between the handles, and to turn you just lean into the handle opposite the direction you want to turn and it will happily turn while moving, without requiring much if any arm strength. Learn this technique and you'll find the whole process less tiring.
I used to simply take the snowblower up on top of the banks to cut them down and blow the snow further back when they got too tall to blow over, but I also always blew the snow as far back as I could so the banks didn't develop much at the edge of the driveway.
Yep, they're easy to forget when the wheel is caked in snow so you can't see the lock.
Yep, you don't often need to make tight turns if you think about what you're doing. Also, even with the differential locked, tight turns aren't very difficult as long as you push down on the handles to lift the front end of the snowblower up off the ground so you aren't trying to drag the skids through stuff.
If you have a sufficiently large snowblower, you might get away with attaching one of those one wheel "boogies" that a lot of landscapers use behind big mowers.