2007 is not complicated, it's just different.
It takes a bit of getting used to, and in some situations it can take a bit of time to get used to, and aside from that, it also adds a few extra clicks here and there.
For me though, Office 2003 and 2008(Mac) are what I use, and enjoy. I find them easier for me to use, even though 2007 has some pretty cool features, styles and pre-select colours.