Star Wars: The Old Republic. I don’t care about all the MMO stuff, but every time I watch or read something star-wars-related, I want to fire it up, get the one month subscription, and go on with some single-player story I need to finish. This happens twice a year more or less.
Seconding the use of this feature as well. I took it a bit further and took 5 minutes to set up a “Personal” focus mode, active only in the weekends where all work-related apps, mail, calls, etc. cannot send me notifications. In my work there are some serious boundary issues, so this helps me a lot with anxiety and stress.