The trick is to figure out if you need one by getting out to where your going to be doing most of your shooting. If you can sit on your rear and see where the game will be coming from or showing up at, then there is a good chance you can use one.
However if like mentioned the terrain is such that you cannot see anything past 5yds when sitting then chances are you don't need one and a stick would suit you better.
I have and use both a mono pod which I carry on short walks around the farm and the Harris bi-pods which I attach to the front swivel for when i head out to sit and wait. Are they cumbersome yes, do they take a bit of getting used to yes, are they a pain to use if game is jumped up and your shot requires you to swing and follow yes, but can all of that be worked around absolutely with just a bit of actual experience using them.
I hunt several areas which allow me to use either the shorter BR style or the longer ones which allow me to sit. One of the biggest uses however is for when the grandson is out with me as it allows him to have a steady rest for short or long shots.
While some feel that longer ranges are forbidden territory, that all depends on how much you shoot them and what the conditions are at the time. Personally I have taken deer at 400yds and hogs and coyotes a bit further using a bi-pod on each. For ranges out to 300 they are great for either, IF you put in the time to learn how and when to use them.
In a situation like this one where we had hogs out at 375-400yds I was able to use the shorter one laying prone,
Same rifle different location, I was set up on top of a flood levee which overlooked this long pasture. I was using the longer one, expecting a shot in the neighborhood of 3-500yds. The hog came in right under my nose at about 30yds. The problem with that was, that the hog came in so close I couldn't see him until I stood up, simply due to the height of the levee. I was sitting back from the edge and he was right down below me. and I ended up spooking him when I stood up to shoot. I had to swing with him, with the bi-pod fully extended. Not fun but effective.
Again the areas you will be hunting will determine more of if you can use one or if you actually need one. I actually have several that I use, but the longer ones are used WAY more frequently simply because I sit more than I lay. Even if you have one and your not sure of the terrain, like mentioned they aren't hard to install when you get out to where your wanting to hunt. All of mine attach to the front sling swivel, and then allow me to attach the sling to them. I can toss even the longer one in my day pack and use it if needed or wanted depending on where I end up or what i might see while out stalking. There are many times I have edged out of the thick woods only to find the deer or hogs I was looking for standing out in the wide open middle of a pasture. I would MUCH rather make a shot off a bi-pod than a tree limb, not that it cannot be done, but the shot placement is SO much better when you have a solid rest.