I have to use Windows 7 periodically, and it annoys the heck out of me too, given the feature applies to every application on that platform.
It's the fact it's inconsistent on my platform (KDE on Debian GNU/Linux) exacerbates the annoyance. I should not have to consider which application I'm in, in order to preempt the way the scrollbar / mouse will work.
With the second - I appreciate that for many people, for much of the time, you're wanting to type something else into the address bar. However, on MS Windows you have to type ctrl-c / ctrl-v to copy / paste. On real operating systems <tm> you just have to select the region -- so having a whole line selected for you when you click near it is unwanted.
But ultimately it's the inconsistency. I need to consider if I'm clicking in the address bar, or another text box, in order to predict what's about to be selected.
And, yes, the Win7 explorer bar has moved me to tears also. I can highly recommend the breadcrumbkiller [1] - even if you don't install it, the rant on that guy's page is well worth reading.
[1] http://twigstechtips.blogspot.com.au/2010/02/win7-remove-win...