Not really man...lets say im watching a youtube video on a tutorial for something I can download for the phone...instead of having to stop the video, go to the website to download it, wait for it to be done downloading, then finish the tutorial, I can just go to site while still watching the video and download it...not to mention just the simple task of being able to download something and opening an app and have that download keep going unlike an iphone where if you open something new, whatever you were previously in stops and cant be restarted until you go back into it, which will stop your new task you were doing.
i guess it depends on the user. i have never thought to myself.. "damn i wish i could watch this video while also doing something else in the background"
regarding downloading something, that works on my iphone too. I can download something and exit the app. As long as its open in the taskbar the download continues