We execute campaigns in 6 languages. We also make a program per asset you download from our site. So the asset programs are a few campaigns + 2 landing pages & an email. Well, across 6 sites, 50 assets. We quickly realised that if a Marketing Manger left the company then we'd be screwed. So instead we added to each top level folder, Sender-Email and Sender-Name as tokens. Then in every email for each country, we've replaced out the Sender info at the top of each email with {{my.Sender-Email}} and {{my.Sender-Name}}
I'm using tokens for all of our Tracking. There's a whole thread on it on the community already, so I won't repeat myself. But on the end of each link I add a standard tracking code, which includes tokens. ?utm_source=Marketo&utm_medium=Email&utm_content={{my.Email-Content}}&utm_campaign={{my.Email-Campaign}} ... Then at each top-level folder I've added the master tokens, which filters into all sub-programs within the folder. Then it gets changed out for the proper name when they create a new program. [if you want to know more, i can help you find that thread]
I also have a token for each country's individual email footers. Ie Unsubscribe, Physical Address, Privacy policy. Those are setup as Lead tokens, so when they have a Business Unit applied, it sets the footer on the lead's record. {{lead.Business-Unit-Unsubscribe}}
Likewise I also have a token for social media. I have a twitter feed per country (?!?!?!) so I need to make sure that people can get to the right country's feed directly from their email, so also during my lead creation process, once a country is applied, the proper social media buttons are inserted, then in all my email templates I have, {{lead.Social-buttons}}
I'm also using tokens for Sales Readiness. So if a sales dude sets a Call Back Date in CRM for them to reminder to follow up. I use a token in Marketo such that 1 day before, it sends an alert to the sales guy & asks them to follow up the next day.
I think those are the most interesting tokens beyond what Diederik has already said, of course in each program we're using tokens, especially for Webinars & Events.
PRO-TIP- If you're working with a token which will be placed into a LINK (ie <a href=), then be sure not to use any spaces in the name! Notice I use hyphens in most of my token names. This makes sure that the space isn't replaced by %20 (the ascii character for blank space) which can break the token from being properly rendered..