Shot my bull moose this fall sitting on my butt with my elbows on my knees. This is a very steady posture and I dropped him in his tracks at just over 200 yards with a lovely spine shot. Yes, prone is a little steadier, but in deeper snow, well, you're not going to lay down are you.
I suppose bipods are all fine and dandy if you're at the range but in the field!?!? As someone else said, I'll use my truck, a tree, a stump, or like I did this past fall, sit on my butt.....lol.
You wouldn't lay down and flip your bipod out in two feet of snow (or more) so it's pretty much useless in a season with lots of snow. Sure you could use it on top of your truck, but your elbow is just as good for steadying your aim and faster too!
I'm not interested in lugging the weight either. Plus, from what I can see, they would only be added hassle in the bush snagging on branches and such.
Now, I can see a bipod would be usefull if you were out hunting gophers or doing some extreme range hunting for say, antelope and you had one of those portable shooting benches. But for day-to-day dear/moose/elk hunting all I can say is, no thank you it's not for me!