I prefer to wait for quests involving a dungeon, I don't like to go into a dungeon just for the sake of clearing it out.

You?

Dungeon diving for the heck of it? Definitely. All the time.

(only thing that'll stop me is a front door locked with a quest key)

It depends. If it is a dungeon I've already been to, then I'll breeze right through it. If it is a dungeon I have not discovered before, then I might wait for a quest for it or just say,"What the heck, I'll explore it."

It depends a lot on my character's mood. Sometimes he goes curious and explores in full, sometimes he doesn't feel like staying longer around.

For me playing rpgs is all about the dungeons with unusual fascinating architecture full of monsters and glorious treasure so i never wait for a quest to pop up. If i have to do the dungeon over its no big deal and usually things are different in some way like higher level creature spawns etc to enjoy.

yes, when i found out some of the dungeons had random quests in them i started clearing out any new ones i found. Some of them reward you with new followers, and i'm all about getting new pack mules

Do I clear dungeons just for the sake of it?

Yes. Yes, I do. I'm a little reckless about it actually.