Disclaimer: I realize there are more keys than minor and major, but those are the ones I've come to relate the rest to due to my upbringing.
I have a philosophy: if you make something and you're not sure if it's great or horrible... it has the potential to be great! In other words, if you are sure about something, it's probably not risky enough to be anything substantial. In my experience, risks seem to make anything creative intriguing. At the end you just need the skills to be able to pull it off.
That's a lot of preface. When I was younger (not even that much younger) I had a tendency to write everything in minor keys. To a metal youngster, it felt safe and anything I did sounded... more or less cool. Recently, I've forced myself to do more things in the major keys and instead of being happy with my music, I've started to love it. I don't know why, but it seems like this simple transition to an uncharted territory (for me at least) opened something up. Using the major keys always felt really tacky and corny. It was like I was writing children's songs. But when I got through that barrier, something just clicked. I felt energized by whatever I did in major. Is it just that major feel or is there something else to it?
I guess this post doesn't really have a point to it. I'm just wondering if other people have noticed patterns in the keys they use when they write songs.