You'll be able to switch between all of your marketing and organization apps easily. You could have one button on your Elgato Stream Deck that launches Google Analytics, another for Twitter, one for Facebook, one for BuzzSumo, and so on. Each of these apps would have its own icon on your Elgato Stream Deck so that you can find it instantly.
You can map specific tasks to each button on your Stream Deck, such as sharing a Facebook post in Hootsuite, posting an update on Twitter, or tweeting a link in Buffer. Once you've done this once, you'll be able to press the right button on the Stream Deck and have everything you need to be done in a single touch!