There is my problem: " after 2 weeks or so".
I suspect you mean hourly use during those 2 weeks. Because it's on my pc for the last 6 months and i use Ms Office like once a week for simple excel stuff and once every 2 weeks for real typing and i'm still at a loss. Numbering is a hell in 2007 and generating a decent table of content failed the first 10 times i tried it. For those things i save and open in OOo, because in that layout i can find my way around it in a matter of seconds and have the job done in, o i don't know, 1% of the time it takes me in 2007. We are a small firm, we don't have the time to follow courses like in big firms. And what i have heard from friends and family, they all work slower in 2007 then when they were using office 2000/xp or even 2003.
I have to agree with sunderland that i hope OOo drops the idee or at least allows multiple UIs so we can select which one to use.