I don't know what you use your folders for, but I initially used them for Projects and quickly realized that it was an issue. Anders is correct in that others have a similar request for folder stacking.
Just out of curiosity. How many folders do you have and what are you using them for?
I don't bother with the folder view or the context view, for the reason you've stated. I just stay on the Main view, and sort by folder or context. Then I collapse the folders and just reopen them as needed. I think this is very close to how it would work if the tabs were vertical instead of horizontal.
If you sort by folder then click "Toggle Dividers", does this give you the view you need?