There's just a slight difference. Click once on the collection set to make it active and then right-click. The resulting dialog will already have the active collection set filled in and you won't have to scroll through a list of sets.
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Yes, you are right... but therein lies the problem. When you click on the collection set to make it the target of the right click, you lose the selection context that you had before.
So my workflow used to be (LR 1.4)
Select 5 pictures in a folder.
Scroll down the collections
Right click on the target collection
Select 'create new collection' from the context menu.
The great thing about this workflow is that I don't need to plan in advance where I'm going to put those pictures in my selection before I scroll down to the collection hierarchy, I can decide that once I look at how the collections are laid out and organised.
This isn't possible using the method you suggest. Instead I have a number of different ways of ending up with my new collection of those 5 images, but I have to 'pre-plan' where they are going in the collection hierarchy.
This is unnatural because while editing at the folder level I am creatively deciding how to group my images on the fly.
Examples of how I'd have to do it in LR 2.
Method 1
Create a collection set or collection read to receive the images I want to collect.
Make this the target collection
Browse images in the Folder view and use the 'quick collection' dot to add them to the target collection.
Method 2
Create a collection in the collection hierarchy.
Click on the new collection so that it is selected.
Browse images in the Folder view and select them
Then scroll to the new collection/set in the hierarchy and use right-button 'add to collection' to add the pictures
Method 3
Browse images in the Folder view and select them
Scroll to the place in the collection hierarchy where I want to add a new collection for these images
Right-button, then scroll through the horribly long list.
Only the inconvenient method 3 allows on the fly collection creation as a direct result of browsing and editing in the Folder view.