My two most noticeable examples:
Opening User folder, the folder view has often changed from medium icons (my preference) to list (I tend to use list view in a number of other folders so perhaps that has something to do with it)
Opening Windows Explorer from quick launch (launches into library view), regardless of what view I select, upon re-launch it is always in tile
Yeah, Win7 took a while to get used to, but once you "get it" it really is the best OS MS released.
I'm not sure I understand what you're seeing, but here are a few tips.
The My (documents, pictures, music, video) folders under your user profile are templates for ALL folders of that type (Right click any normal folder, select properties from the alternate menu, press the Customize tab - you'll see a dropdown menu of available folder types).
In other words if you change the columns, view, sort, etc of your My Music folder, ALL folders with a type of music will present the files the way you set it in My Music... every time.
The launch location of explorer sort of defines where it opens
The explorer on the Task bar opens Libraries by default
There is a tutorial that explains how to change or customize the Windows Explorer launch behavior
You mentioned quick launch. Add the objects you want in quick launch directly to the task bar instead.
Libraries.... if you're familiar with Windows Media player library, then you have a starting point in understanding Windows Libraries. Basically, Libraries present file and folder information from other locations, they don't hold any real data, they just organize it. This is a pretty cool feature.
You can house your data anywhere, any folder, any drive and always have one place to look for it - the Library you included the folder. You don't have to go to each folder, just look in your library.
It takes a while to work through it, but once you "get it" it's great!
Right click everything! See what is presented in the alternate menu. I found lots of stuff that I couldn't figure out where Win7 put it - Right click away!
There is some help in the links of my signature, but many links (MS replaced Win7 with Win8) might be broken. I'll fix them if you find any and let me know - thanks.