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If they could add the ability to stitch photos .....
They have to leave something for LR6, but stitching really needs layers, so I will be keeping CS5
I have both. I find the flexibility of LR to be more advantages than Aperture. Try downloading the trial version and play with it and see if you like it. One feature I really like is the file manager. It lets you organize your files in folder and directories as you wish vs Aperture that puts all the images in one big Library. Should the Library ever get damaged...well then there goes all your images.
aperture does keep the images in a central "package", but they can easily be accessed if you right click on the aperture library and "show package contents". then, navigate the directory like a normal finder window. folders/projects are still there in aperture, they are just more symbolic organization