Because when you add honey you are actually doing more to boost the ABV and dry the beer out, than to actually get any honey flavor.
That's the thing with people adding honey to beer, they really AREN'T getting much honey flavor in their beer, because it is fermenting away to alcohol, like making mead.
Which unless you kill fermentation and back sweeten with honey that won't ferment, really doesn't have that much of a sweet honey flavor. (To get a real honey flavor, use the darkest you can find, with the most concentration of flavor, or even better, use Gambrinus honey malt ProBrewer Interactive - View Single Post - Honey Malt)
So if you put a lot of honey in, it will have the same basic affect as adding table sugar to it...it's going to dry out and thin the beer, and add to the alcohol "taste."
But it will mellow out in time like any higher grave beer.....It will be like roacket fuel for awhile, then smooth out...
But in the future if you want a real honey taste then ad some honey malt to your grainbill...you will be surprised...it will taste like most people want honey beers to taste.......