Another point that hasn't been mentioned is that when I am going forward with the rear blade set at an angle, if I put it at too sharp an angle it will actually push the rear of my tractor sideways. My rear blade has limited angle settings, but I have to find just the right angle that allows the snow to slide off without pushing the back end sideways.
I pretty quickly learned to load the front end loader with snow to give my front wheels better grip (R4 tires with no chains). Wet snow is much better than dry snow - weighs more for sure.
Also, just to be clear for the original poster, I usually just drive over the snow - forward - to let the rear blade do its work. If the snow is so deep that I can't driver over it without wheels spinning even in mechanical 4WD, then I'll use the front end loader to move the snow and then clean it up with the rear blade. Moving snow with the front end loader can be a tedious process compared to the rear blade. Scoop, backup, angle off, dump, repeat ... a lot! Still, any time on the tractor is a great thing - until the cold weather soaks in.
I've been noodling getting a front-mount snow blade, but so far just can't justify the cost. Plus, I'd prefer to keep the front end loader on the tractor during the winter months - well all the time. I know that they make snow blades that go on the FEL's quick attach. I'm noodling that too. Again, so far I've not pulled the trigger, mostly due to the costs.
Finally, as others have mentioned, using the rear blade with the cutting edge backwards does real well on gravel and even lawn (my own use). I don't need to do that a lot, so I'll usually do that very carefully (gently) by just driving the tractor backward. I've read that this presents a risk of bending the three point hitch arms or other parts. So far this has not happened. I try to be gentle about it. If you need to do that a lot then you're best to spin the rear blade around and drive forward with the cutting edge of the blade facing "backward".