I don't think I have much of a real preference of E over I, in the classic extroverted sense that most tests measure.. I've got traits of both social extroverts and introverts. I live alone and consider my home to be a private sanctuary unless I choose to have people over. When I meet someone new, I usually do a lot more observing and listening than talking.. but when I do talk, I don't often have to think about it first. I prefer small groups to large crowds, but I'm out among other people most nights of the week. I have many, many "shallow" relationships (probably 100 acquaintances that I see on a regular basis). I don't really welcome being interrupted in conversation as most extroverts do and can easily lose my train of thought when I am. I'd wager that my inner world is more rich than most E's. I spend a lot of time introspecting and focusing on myself and my own thoughts.. I keep a journal and record them. At work, I have no problem marshalling or directing other people, and I love to work on teams (especially when I'm in control ), but I also welcome projects that I can work on alone and apply my own strengths. I've got a lot of hobbies that put me out around other people (dancing, pool, yoga..) and others that I equally enjoy that don't (programming, reading..). I'm pretty open, especially around people that I know.. much more so than most introverts. I think I do get more energized around other people on the whole, but I do enjoy and need my alone time.
Overall, there's a very obvious contrast for me when I'm around a bunch of strong extroverts, just as there is when I'm around a bunch of strong introverts.. in the former case, I can't get a word in edgewise; in the latter, I get impatient because nobody else offers their thoughts as readily as I do.
Despite that.. when I got back into MBTI, the "E" was the only trait that I was certain of, with having tested as ENTJ, ESFJ, ENTP, and ESTP and having identified with all of those descriptions at one point or another. But now I'm cognizant of what my preferences are so my type is pretty clear. Strange how that works..
My lack of preference probably makes less optimistic and assertive than other ENTJ's, but also less domineering, less arrogant, and more willing to listen to other people. That's the major difference between that profile and how I view myself.
I guess my life philosophy overall is that there's a time and a place for everything.. including all of the different cognitive functions. I'm just working on developing the ones I'm deficient at and learning from others' strengths. That must be why I admire my ENFJ best friend and why I'm dating a ESFP