Ok, I know this is of little help to h_a, but being a daily user of AutoCAD I had to jump in a bit. Basically I think there are two differant program control setups that stared many many years ago, the graphics artist ones and the cad ones.
I started playing with Acad back when I was 12 or 13 (they had just gotten it in the shop class room at my jr high/high school, v10 I think) and now 15+ years latter (version 2002, yea my compony is behind the times) I still use it so I'm very biased and it's use is so intuitive to me that I don't even think about what buttons I'm hitting. Because of this I have a much more difficult time trying to use programs like PhotoShop, because they were formed from the other side of the mountin. For instance it's so not inntuitive for me to hold a button down while making a selection, or my personal bain the fact that the scrool wheel dosn't zoom-pan like the new autocads do.
Now I have friend's who grew up working with graphics programs (I was an Mech Eng in school, but I got a broadcasting minor, go figure) and they of course can use PhotoShop lickity split, but when they've had to jump into AutoCad they are as lost as can be, I've heard the "why do you have to click again" complaint more then once.
Is one of these systems easier/harder then the other, probably not for a beginer. But once you have exposure to one or the other you're always going to find the other more dificult.
Have Fun!!,
John
P.S. As I was typing this I realize that my learing to use word processors before e-mail programs is also an issue, I always want to hit tab before a new paragraph, DOH.