I'm doing financial reporting for a mid-size public company and I LOVE hyperion. In fact, most people come to me for advice in setting-up templates/running ad-hoc reports or just to verify balances (because they don't trust their own pulls). If you can master the tool, you'll definitely raise your value as an employee.
That being said, your use of hyperion will vary depending on what position you're applying for. If you're doing global FP&A, you will use it to pull balances for all regions (foreign regions if they do business overseas), pulling balances in local currency, historical currency (for constant currency uses) etc. The same would apply for Financial reporting and Consolidations.
Now if you're part of a regional accounting team, then your use of hyperion will generally be more limited. You're usually just pulling a few accounts for your section and your region. And the use will be even more limited if you're just doing one function of accounting, such as AR/Revenue or Fixed assets.
I think it would be difficult to teach yourself hyperion from just a manual or tutorial. It's more important to learn about the structure of the organization and chart of accounts before delving in and just creating reports and pulling balances from the various cubes that hyperion offers. It's a tool that you need someone there to guide you through, but that's just my take on it.