I have a strong preference for first person, especially when writing. Whenever I write in third person, I'm inclined to skip over everything very quickly. One third person omniscient short story I wrote covered about six years in 10 pages or so, while my 40,000 word first person novel only covers a couple months. I don't have the patience to slow down and focus on things in third person, and almost everything I write is very character driven. I have written a couple successful things in third person, but it's like pulling teeth for me.
I prefer reading in first person as well, though I won't ignore a book because it's in third person; if the story intrigues me I'll give it a shot regardless. I'm definitely most interested in character driven things as well, though, where there's no big-bad-guy or fantasy setting to wade through. For the genre I'm interested in, first person tends to work best because it focuses on the emotional journey of the character, which is what I'm there for.
@Dr_RyBread I agree that emotions feel more natural in first person. It puts the reader inside the story instead of watching it on a screen.