Hmm, I had to give this some thought and it might not work as well typed out as it is in my head right now heh.
I think I can sum it up perfectly with this one sentence though: Iron Maiden have made me view the world differently, in a good way.
I didn't get into Iron Maiden until late 2006/early 2007. They were a very popular band to my dad, and I always heard some of their songs here and there when my dad would jam to them, but I didn't think anything of it at the time. The first time I personally experienced an Iron Maiden song, embarrassingly enough, was when I was playing Guitar Hero II and one of the final songs in the game was "The Trooper". I remember playing that song on the game and was absolutely amazed at how awesome it sounded. NO other song in that entire game did that for me, and immediately after I was done with that song I went to my dad asking him about Iron Maiden. He then gave me their entire discography and that is when life really became great.
I was glued to them then, just as I am still glued to them now. The lyrics, the guitar riffs and solo's, Bruce's amazing vocals, it just all adds up to become eargasmic. No other band has ever captivated me as Iron Maiden has, and I doubt any band ever will again.
One of the things that I believe really shows how much a love Iron Maiden is (as morbid as it may sound), they were what helped me through the time when my mom passed away in 2008. In fact, this was just four days after I had seen them for the first time, on June 11 2008 in Chicago, IL. During and after my mom's passing, I had just really gotten into the Brave New World and Dance of Death albums, and listening to their music... soothed me? Assisted in helping me heal, if that's appropriate to say. As I opened this up with, their music has completely changed the way I view the world. If I am ever having a bad day, for example, I can simply listen to Iron Maiden and will almost feel better, and more pumped. No other band has ever managed to do this for me.
Adrian Smith and Dave Murray were the inspiration for me to start playing guitar. And Bruce Dickinson is probably my biggest idol of all time, he just seems like such an extraordinary person. And while I don't know that much about drums, I'm sure Nicko is considered a god amongst drummers.
My love for Iron Maiden has grown over the years, especially this past year, since I lost my dad in late 2011. Let's face it, losing my mom and dad in a three year span, I had a pretty shitty teenage life. But listening to Iron Maiden did wonders in trying to help me through it. Iron Maiden was always there for me though, and is still there for me. That is why they are so special in my opinion.