Bigger is fine, all depends on what the intended use is & how much weight you are prepared/able to carry. I have never in my life ever needed to cut wood for the fire whilst in the forest. I use my tomahawk for making shelter, cutting trap & shelter pegs, generally making things I need whilst in camp. It will serve me as a hunting tool if needs be & for self-defence. But a larger axe is handy when constructing larger shelters or a garden fence or pallasade.
I spent a lot of time in English forests during my youth, now I live in a forest in New England NSW. The woodlands are a little different, but not that different. What do you chaps with larger axes use them for?
These videos are all relavent if you are interested.
Mainly because I hate having to stoop over or getting wet knees, I use a longer axe. I'll say that mine isn't really a full size axe its only 600 mm (2') it's not that much longer in reality to a SFA (5" shorter), bearing in mind a full size axe is 34" in length. The extra haft length helps in areas where a short axe is a pain. I also find that its safer to use as it would the hit ground not your legs. It can still be used for all the stuff like feather sticks and carving, but it can also fell standing dead wood easier. I'm not really bothered about the weight much as it's not too bad for me, but then again I'm not carrying all that much to start with. As for the longest expeditions I have done I used a sit on Kayak as transport, so it didn't matter at all