I've got an above average dick, not huge, BUT I have been fucked by a lot of very big dick.
I can say the best things about a beautiful big cock are:
(1) The thrill/suspense of the foreplay and anticipation, looking at the guy across from me and knowing he's got a heavy dick between his legs, then the groping/feeling/mouthing before it's all unpacked. When I'm handling a big dick, I lose my head and tend to shower the guy I'm fucking with compliments.
(2) Taking his huge boner with relish (not winces and "go slows") and taking on the challenge of using every inch of my body to bring him to an explosive climax (hopefully several, if he's keen).
(3) Big cocks take me to intensely deeper realms of pleasure - the stretch of a big dick, both in the butt and mouth, is indescribable.
(4) Big cocks are just plain fun to play with. I can occupy myself for hour between the legs of a flacid, hung dick, gently and playfully just coaxing it between hard and soft and enjoying the texture and sensation of it.
So to all you big dicked men out there - especially the ones who've fucked me - I salute and thank you for your warm donations.