Well you didn't want it any other way: here's an analysis of all RAW files I shot the last 1.7 years that still exist on my hard drive.
It's based on about 15k files. A few 100s to 1000s have been deleted esp. when I took smoke pictures (the 1000s missing smoke pictures will add to the Center AF Point ;). Additionally not included are the pictures from the beginning of my experience with the 20D when I still shot JPEG only (not too long).
I didn't analyse the data for automatic or manual AF Point selection, but most of those are multiple AF Points and included in "Others". "Others" is the sum of all single AF Points and multiple ones with a count below 1% of all the points available. Considering the very low numbers of multiple active AF Points I assume that most of the time I did choose the active AF Point manually (which I do now all the time).
The "Manual" AF is from smoke shots and panoramas I suppose.
So what's the conclusion for me? Only the center AF Point (it's type and sensitivity) is important for me and I do not need to care about other AF Points my next camera might offer...