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From my experience, the Tableau conference is an amazing way to see what other people are using Tableau for (great inspiration) as well as immense learning opportunities. Check out https://tc16.tableau.com/learn/schedule/tuesday and scroll through the days to see if anything from last year's conference would've interested you. This will give you a good idea of what to expect for this year.
If you plan your schedule well and go to a mix of classes, you will see ROI for sure. I learned a few new tricks, got pumped up by what other people in the Tableau community are doing but the most valuable lesson I learned was to build more meaningful dashboards that answer the question. When I returned from TC16 I switched our strategy at my work place to do exactly that.