I've learned a tremenous amount of skills on my current job.
Full life cycle Data Warehousing for starters.
From pulling data from source systems, to modeling tables, to staging the data, to applying business rules and ETL to the Data Warehouse.
And working with Cubes and MDX and Calculated Measures and KPIs.
I've done much of this work on prior jobs, but now I get to do everything combined, just about every day. There's talk of the death of the Enterprise Data Warehouse. I probably contributed to the mantra when I worked with Tabular Model and Power Pivot a few years ago.
But just about every client I'm working is using EDW. And some use SharePoint with Power View and some use Performance Point, and most use SSRS reporting services. And many use MDS Master Data Services as well, Not many using DQS Data Quality Services.
I feel comfortable in SSAS now. And that's saying a lot. It's been a long time in coming.